I'll describe how to do the bug.

1. Get a first blood on someone. Clock is very unlikely to say anything, or he'll say one of the regular voice lines.

2. Kill someone afterwards (but don't die in the meantime). Even if you get the kill like x minutes later, Clock says "FIRST BLOOD! Hahaha!"
3. Kill someone again (without dying). "First blood!" Clock says.
4. Kill someone again (without dying). "First blood ahahaha"
5. Repeat.

It'll keep on happening until you die. Volvo fix plz