Just leave the dungeon, I rather face 15 min cooldown from DF then run a group of idiots for 30-40 minutes. As a tank you should decide the pace and not them.

Just done Sunken Temple and in my group there was a idiot black mage, who kept spamming sleep, instead of doing damage. We tried kicking him out, but it failed, because the healer was his friend. After explaining to him that doing sleep was a bad thing, he told me that he knows this and wants to only cast sleep, because he can. This is one of the reasons why we have a shortage of tanks, to many idiots ruining for the good dps players.

/rant

OP, just leave, do not bother with the headache.