First boss fight, he dies and uses return immediately. No biggy, we've all made that slip-up.
Only it happens every single boss encounter. He eventually dies, and then immediately returns. Hm.
Couldn't time it right to kick before loot is opened, so I ask to wait.

... But unfortunately, I overestimate my team.
("Why does she sound so self-important in that last message?" It's because I wanted to leave in the logs that I DID participate, so he can't try to pull an Uno-reverse on me for joining the fight late.)

Not thrilled about the people who tried to play kindergarten teacher. I'm sorry you don't like conflict, just ignore the chat box then.
His response to being told to learn the fight was that he'd "rather do P4S with party finder". He actually does very well, but then at about 20% he dies and of course immediately returns out of the fight. Clap clap.
And yeah don't worry I'm in the process of reporting and asked others in the party to report also. I think I'd be less salty if it wasn't a mentor. This is the stuff that leads to good mentors getting heckled.