Previous bug with bane http://dev.dota2.com/showthread.php?t=27710
But this is somehow going further:
First time EVER to use lvl 1 ulti on an enemy gives only 4 damage instances
[01:02.66] Pudge receives FIEND'S GRIP debuff from Bane.
[01:03.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2449->2374).
[01:04.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2378->2303).
[01:05.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2307->2232).
[01:06.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2235->2160).
[01:08.36] Bane hits Pudge for 66 damage (2167->2101).
Second time to use lvl 1 ulti on an enemy gives 5 damage instances
[01:11.73] Bane hits Pudge with FIEND'S GRIP for 75 damage (2114->2039).
[01:11.73] Pudge receives FIEND'S GRIP debuff from Bane.
[01:12.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (2043->1968).
[01:13.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (1972->1897).
[01:14.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (1900->1825).
[01:15.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (1829->1754).
[01:17.36] Bane hits Pudge for 66 damage (1761->1695).
First time to use lvl 2 ulti on an enemy gives 5 damage instances. But the first tick does lvl 1 damage
[01:20.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (1707->1632).
[01:20.69] Pudge receives FIEND'S GRIP debuff from Bane.
[01:21.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1635->1519).
[01:22.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1522->1406).
[01:23.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1410->1294).
[01:24.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1298->1182).
[01:26.26] Bane hits Pudge for 67 damage (1187->1120).
Second time to use lvl 2 ulti on an enemy gives 5 damage instances. But now all all damage instances are from lvl 2
[01:29.36] Bane hits Pudge with FIEND'S GRIP for 116 damage (1132->1016).
[01:29.36] Pudge receives FIEND'S GRIP debuff from Bane.
[01:30.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (1020->904).
[01:31.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (907->791).
[01:32.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (795->679).
[01:33.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (683->567).
[01:34.96] Bane hits Pudge for 68 damage (572->504).
First time to use lvl 3 ulti on an enemy give 5 damage instances. But the first tick does lvl 2 damage
[01:38.86] Bane hits Pudge with FIEND'S GRIP for 116 damage (2449->2333).
[01:38.86] Pudge receives FIEND'S GRIP debuff from Bane.
[01:39.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (2337->2176).
[01:40.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (2180->2019).
[01:41.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (2022->1861).
[01:42.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (1865->1704).
[01:44.39] Bane hits Pudge for 68 damage (1709->1641).
Second time to use lvl 3 ulti on an enemy gives 5 damage instances. But now all all damage instances are from lvl 3
[01:45.66] Bane hits Pudge with FIEND'S GRIP for 161 damage (1645->1484).
[01:45.66] Pudge receives FIEND'S GRIP debuff from Bane.
[01:46.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1488->1327).
[01:47.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1330->1169).
[01:48.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1172->1011).
[01:49.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1015->854).
[01:51.26] Bane hits Pudge for 69 damage (860->791).
Edit:
When Rubick steals the banes ulti it happens almost the same. The first use ever does not have the tick at t=0=gettingdebuff. BUT he has an extra damage tick at t=losingdebuff
[21:06.41] Bane receives FIEND'S GRIP debuff from Rubick.
[21:07.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1897->1736).
[21:08.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1739->1578).
[21:09.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1581->1420).
[21:10.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1423->1262).
[21:11.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1264->1103).
[21:11.44] Bane loses FIEND'S GRIP debuff.
[21:12.17] Rubick hits Bane for 55 damage (1105->1050).
So for the seconds time casting the ulti Rubick can deal 6 instances.
[21:14.84] Rubick hits Bane with FIEND'S GRIP for 161 damage (1058->897).
[21:14.84] Bane receives FIEND'S GRIP debuff from Rubick.
[21:15.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (900->739).
[21:16.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (742->581).
[21:17.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (583->422).
[21:18.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (425->264).
[21:19.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (267->106).
[21:19.87] Bane loses FIEND'S GRIP debuff.
[21:20.44] Rubick hits Bane for 55 damage (108->53).
But this is somehow going further:
First time EVER to use lvl 1 ulti on an enemy gives only 4 damage instances
[01:02.66] Pudge receives FIEND'S GRIP debuff from Bane.
[01:03.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2449->2374).
[01:04.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2378->2303).
[01:05.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2307->2232).
[01:06.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (2235->2160).
[01:08.36] Bane hits Pudge for 66 damage (2167->2101).
Second time to use lvl 1 ulti on an enemy gives 5 damage instances
[01:11.73] Bane hits Pudge with FIEND'S GRIP for 75 damage (2114->2039).
[01:11.73] Pudge receives FIEND'S GRIP debuff from Bane.
[01:12.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (2043->1968).
[01:13.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (1972->1897).
[01:14.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (1900->1825).
[01:15.76] Bane hits Pudge with FIEND'S GRIP for 75 damage (1829->1754).
[01:17.36] Bane hits Pudge for 66 damage (1761->1695).
First time to use lvl 2 ulti on an enemy gives 5 damage instances. But the first tick does lvl 1 damage
[01:20.69] Bane hits Pudge with FIEND'S GRIP for 75 damage (1707->1632).
[01:20.69] Pudge receives FIEND'S GRIP debuff from Bane.
[01:21.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1635->1519).
[01:22.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1522->1406).
[01:23.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1410->1294).
[01:24.73] Bane hits Pudge with FIEND'S GRIP for 116 damage (1298->1182).
[01:26.26] Bane hits Pudge for 67 damage (1187->1120).
Second time to use lvl 2 ulti on an enemy gives 5 damage instances. But now all all damage instances are from lvl 2
[01:29.36] Bane hits Pudge with FIEND'S GRIP for 116 damage (1132->1016).
[01:29.36] Pudge receives FIEND'S GRIP debuff from Bane.
[01:30.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (1020->904).
[01:31.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (907->791).
[01:32.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (795->679).
[01:33.39] Bane hits Pudge with FIEND'S GRIP for 116 damage (683->567).
[01:34.96] Bane hits Pudge for 68 damage (572->504).
First time to use lvl 3 ulti on an enemy give 5 damage instances. But the first tick does lvl 2 damage
[01:38.86] Bane hits Pudge with FIEND'S GRIP for 116 damage (2449->2333).
[01:38.86] Pudge receives FIEND'S GRIP debuff from Bane.
[01:39.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (2337->2176).
[01:40.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (2180->2019).
[01:41.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (2022->1861).
[01:42.89] Bane hits Pudge with FIEND'S GRIP for 161 damage (1865->1704).
[01:44.39] Bane hits Pudge for 68 damage (1709->1641).
Second time to use lvl 3 ulti on an enemy gives 5 damage instances. But now all all damage instances are from lvl 3
[01:45.66] Bane hits Pudge with FIEND'S GRIP for 161 damage (1645->1484).
[01:45.66] Pudge receives FIEND'S GRIP debuff from Bane.
[01:46.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1488->1327).
[01:47.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1330->1169).
[01:48.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1172->1011).
[01:49.69] Bane hits Pudge with FIEND'S GRIP for 161 damage (1015->854).
[01:51.26] Bane hits Pudge for 69 damage (860->791).
Edit:
When Rubick steals the banes ulti it happens almost the same. The first use ever does not have the tick at t=0=gettingdebuff. BUT he has an extra damage tick at t=losingdebuff
[21:06.41] Bane receives FIEND'S GRIP debuff from Rubick.
[21:07.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1897->1736).
[21:08.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1739->1578).
[21:09.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1581->1420).
[21:10.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1423->1262).
[21:11.44] Rubick hits Bane with FIEND'S GRIP for 161 damage (1264->1103).
[21:11.44] Bane loses FIEND'S GRIP debuff.
[21:12.17] Rubick hits Bane for 55 damage (1105->1050).
So for the seconds time casting the ulti Rubick can deal 6 instances.
[21:14.84] Rubick hits Bane with FIEND'S GRIP for 161 damage (1058->897).
[21:14.84] Bane receives FIEND'S GRIP debuff from Rubick.
[21:15.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (900->739).
[21:16.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (742->581).
[21:17.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (583->422).
[21:18.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (425->264).
[21:19.87] Rubick hits Bane with FIEND'S GRIP for 161 damage (267->106).
[21:19.87] Bane loses FIEND'S GRIP debuff.
[21:20.44] Rubick hits Bane for 55 damage (108->53).
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