Y'know, I saw the alley scene as weird and creepy too, at first, but going back — it's uncomfortable, yes, but I think it's made less creepy by the fact that Kyouko leads Nakazawa into that alley; he's not luring her in. He misreads her intentions, and kabedons her. Boxing her in like that is bad, and his line sucks, but he seems mostly acting honorably, if misguidedly. The fact that Kyouko didn't have to break his legs probably speaks well for him.
(Does Nakazawa have characterization beyond "Either one is okay"?)