> and neglect any other human walking by this back alley

Not just the back alley. The back alley itself has nothing specifically to do with it. The test would have to be something like the crow attacks this person but not anyone else around the building generally. That doesn't really make a lot of sense from the crows perspective either though... it's concerned with the plight of its mate, so why focus instead on a random person who's a decent distance away unless it can perceive a specific connection, e.g., by recognizing them.

It's moot anyway. I think it's pretty well established crows can recognize human faces.