I remember a run (that surprisingly won) where the middle group kept dieing constantly. (the part where u split into 3 groups, we had both off tanks from Group A and C come help them)

When we were on Behemoth, the DPS stayed on behemoth, and ignored adds.

When asked to kill adds, and place comets elsewhere, they said "No, I dont want to, It's not like you need our DPS anyways, we'll stay on the boss"

Their off tank refused to turn the tower off too... somehow after 10 tries, we managed to win anyways...

(Because of how bad this group was, i decided to hit need on the tank belt, thinking there was no way we'd make it to last boss to get the body piece (only real piece i needed) and sure enough, Behemoth dropped the body, and the other tank passed... I was so pissed xD )