I agree with you that something must have happened, but forcing him to talk about it would probably only put him back in a state. For what it's worth, he seemed relieved when I told him we do come back...

[ It had hurt him as well, to have his friend so angry as to threaten violence after all they'd been through. But above all else it was worrying. Sypha's account makes it even moreso. ]

He does tend to bottle things up, doesn't he?