It's not those details that strike him, as he notices McCree start to follow. Instead his mind swerves towards another motivation entirely. He doesn't have a choice...meaning he's been ordered to? By Overwatch, or someone else? No matter. He wants no part of any of it.

"It was not a request," he replies bluntly, and moments later he turns, a hand going to the rail of a nearby fire escape. In a matter of seconds he's swiftly climbed his way up onto the second landing, before slipping forward to continue up the remaining steps.

If the outlaw will not desist on his own, then he will simply have to lose him. Simple enough. He looks nowhere near nimble enough to keep up with him.