Well it's not like he was really himself at that moment, so someone properly charismatic could probably persuade him getting beaten up by them was for his own good. I mean, he was in the mood to thank all of them for pretty vague reasons.
And what if the Bureau somehow managed to get control of the extremely powerful artifact that can hurt them pretty badly, and then persuaded him to help them? Which seems to be what happened roughly five minutes after they left.
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