The hunched over rak has a move where he pins the target to the ground for a very long time and he soft enrages, increasing his damage by a significant amount, if you kill him first it just makes your healer's job a lot easier. A geared and skilled enough group could honestly kill them in any order though.
This. As a healer it sucks when he does this to you. Cause not only can you not heal yourself you cant heal anyone else as your pinned to the ground.
I am geared mostly 61 as heals and if I have a group of about the same geared then it matters very little however if they are fresh 50s and the healer is pinned you may be screwed