If you guys think this was professional, you've been watching more movies than the shooter was...he does tons of things wrong.

The slide probably isn't coming back far enough to reset the striker so he's got to do it manually with every shot it looks like. Maybe he's just pulling the trigger too fast for the silencer rigged maybe he's limp wristing it...either way I see multiple ftf.
I wonder if He's not familiar with the weapon or if the silencer is causing issues. He's def not a pro...he shot with that witness literally right there. He also shot from a distance. A pro would have gotten as close as possible and would never have used a weapon that malfunctions like that. This kid got lucky that woman wasn't a dude cuz she could have tackled him... The silencer really helped too. I bet no one heard anything with the sounds of the city. I hear they found empty casings and live rounds.