Jason doesn't understand what's going on. This was for Twin, for Loki, even a little bit so Bruce would know how he's doing after he stormed off. It wasn't supposed to be about him but Jason has managed to twist everything so it's about him once more. That's kind of his superpower, isn't it?

He takes a step closer, but doesn't lower his guard. It doesn't really matter, Clark would just grab him if he really wanted to. And the window is still there if he needs a quick retreat.