It's curiosity that gets the better of him, in the end.

Before Jesse can finish arcing backwards and falling into the alley, his progress is halted with a jerk, as Hanzo's fist curls into fabric at his chest, holding him in place for a moment. His eyes narrow in cold study, before makes his decision. He wants an answer more than it would amuse him to watch Jesse break his neck trying to follow him.

And Hanzo yanks the outlaw forward, allowing him to find more sturdy footing beneath him on this shared rooftop.