[_Drogo_]

I'm not sure Guy played his JJ badly. Against most players that would be a terrible line since, as already noted, it turns your hand into a bluff. However, against someone who bluffs a lot (Jamie) and who plays combo draws like pair plus gutshot strongly (Jamie) which is a hand you aren't that far ahead of, then a raise is the perfect play.
Think about how many cards you don't want to see on the river even if you think Jamie is full of it.

Maybe that isn't what he was thinking, maybe he is pretty bad and just thought "ZOMG, overpair! I can't lose!" but maybe he isn't as bad as we thought. It is hard to tell, he is getting hammered by the deck.

Tony