Juggernaut uses Omnislash in a situation where it will hit Windrunner. At this time, Windrunner is using Wind Run.
Windrunner takes no damage from Omnislash, because Omnislash deals physical damage and wind run gives 100% evasion to physical damage.
Windrunner is hurt by Omnislash.
More details about the situation in which I noticed it:
Omnislash was started on a Windrunner illusion (which was created via manta style). The slash then bounced to the real Windrunner, damaging (and killing) her even though she was in middle of wind run.
Please let me know if there's any more information needed.