It isn't in his nature to pursue an argument. I'm thinking more that he needs a word with the thief because of whatever he is supposed to be doing for the party, and the timing is such that the thief ends up taking him hostage. The thief has a gun to his head, things are happening, it seems like it is all going good until another agent shows up, the thief draws a second gun, and when Laurel tries to shoot the thief she hits Jamie instead, on the side of the head because of a sudden, unpredictable move. The second agent takes out the thief, but Jamie's still in a coma. :)

I could start the scene with Jamie going to find the thief, if you like?