I didn't even think about letting the guy die, that's a good idea of course.

Alas, what ticked me off wasn't the tank watching the cut scenes, not even the party rushing through the content (I'm guilty of that myself a lot of the time). What I absolutely can't fathom is, how anybody could kick that poor new guy for being afk when he was just watching the cutscenes and it's really no issue for the party to finish the duty with 7 people while he enjoys the story. If anything, the new guy should be mad at us for not letting him participate in the content.