Squirrels can be obnoxious. When we first moved to TX, we rented an upper floor apartment until our house was built. There were squirrels in the AC vents who would chatter at you at night. Spooky at first. We were only there for a few months though.
I do agree that there is something else going on with the young man, sadly. After the Saratoga shooting, there's some discussion on whether screamed 'drop the gun' repeatedly gets through to folks who are in some abnormal state. Different discussion.