Brutus Attack Animation Bug

Hello! I'm currently a hardcore player working my way through the game and I come to the beta feedback forum to express a frustration of mine.

I had been working on my marauder for the past 3 days playing 10+ hours a day. You can already tell what is going to happen here. I finally made it to Brutus on Merciless and engaged him. Upon using certain abilities Brutus' "Wave" attack animation doesn't "show". I was hit by one of his waves due to this, and started running. I heal back up to half and suddenly I'm dead. No animation, no sound was played, just I'm dead, Brutus is sitting there derping away.

I died, I'm not whining about that. I would like to see this "bug" looked at. It is VERY frustrating to die to a bug, knowing that it wasn't a play mistake. I'll try to replicate this on a new character, but I'm not sure if I want to play Marauder again. Ah well, thanks for your time.