[That actually cuts into him, both the bit about not being his brother as well as the assumption of not knowing him. Whatever the version, weren't they both brothers at some point? Shouldn't that matter?

But no matter, he doesn't let that outwardly phase him, and instead takes it out on a demon that's snuck up on him. Using that to get off a punch and kick to send it flying with the kitsune's strength.]

Why should it MATTER what version of you is you? You're still Jiang Cheng! You're still MY-- you're still my brother dammit, even if you aren't the one I know!

[At least he wants to still be the man's brother, no matter how little of a chance he has of that ever happening again.]