[BUG] Mobs knocked out of combat but

I was doing Merveil, the act 1 final boss and was attacking him with Heavy Strike which was slapping him back a good deal, until suddenly the boss was in the wall and no longer hittable, manged to kill him when i called in a friend with ranged damage, had no loot drop.



Link to a screenshot of where i managed to hit him:

[IMG]http://i47.tinypic.com/73mhyh.jpg[/IMG]