OH NAH! This is not "yo, you alive? no way!" type of face. This is pure terror on this man's face - ABORT EVERYTHING, only talk in the open field, with backup watching you.
Robin looks guilty. Robin looks like somebody who regularly shop-lifts and suddenly meets a policeman waiting for him at the door to his apartment. He's not happy-surprised or just surprised there, only scared. Oh, my hearbeat got faster immediately, but I gotta sleep RIGHT NOW.
I have thoughts and theories already, but gonna leave them for the next chap.