You should be fine as long as you reported it in game, and logged out/in after that before it became obvious that you werw abusing the bug.
More important is that the bug is reported, how it can be replicated and what can cause it to stop. If he informs people through /y that he's harmless but somehow invincible due to a bug, then meh. Would be worse if it was exploitable, like the invincible vehicle someone would get in PS1 once every 5 months or killing ghosts of vehicles.