Jim shifts ever so slightly, and maybe, just maybe, his lips tighten a little more.

"I thought I had." Killed Gamble, that is. Because, really, what is he supposed to say to that, the admission that Brian would have put him down?

Of course, there's no way that the sound Street had made earlier could have been mistaken for a sob of physical pain rather than raw grief. So Jim has softer emotions in there somewhere. If Gamble feels the need to call him out on it ... well, Jim can downplay it, but he can't take it back.