Had a tank not say a word all dungeon. Our healer stopped to inform a newbie boss mechanics as the tank stormed in and tried to solo a boss. He did pretty decent, rotating defense cool downs and recovering health as a war.

Speeding up to last boss, the tank does not pop a single Def cooldown, dies and then does not bother provoking the boss back onto him once raised. He did this three times before saying "I don't know what I'm doing wrong? xD"

The xD gave him away