Originally Posted by
Arthemus
This is in fact a well known issue around the game. The same goes for Hallowed Ground on Paladins as well. Its essentially a server latency issue which registers the final blow before the heal, and causes both actions to occur. Unfortunately, benediction cannot heal a dead person, and so the person dies anyway.
Animation lock is a pretty crappy thing as well (where the animation has to complete before the action actually goes off), which we are all hoping for a fix... When that happens is anyone's guess.