Bravo to the guy in the window for doing something and trying to talk down the maniac, distract him, and directing the police to the maniac. I would have probably tried to do the same but would have likely peed myself a little too.
It's a shame the guy in the window didn't have a crossbow, bow and arrow, shotgun, or rifle. Any of those could have stopped the maniac shooter in the street. He stopped moving a few times and was fairly close.