Pssht, don't underestimate Invincible.
5 seconds last = 5 seconds win
Do you know how much damage Invincible can take? Especially from bosses!? 8D That's why tanks love clerics.
Back on topic: Yea lots of times I'm a KSer >.> Try to help people out. If they tell me that they're handling it fine, I back off. If they shout at me and curse, I keep on hitting the monster and then collect the drops. lol