Crazed Bum In My Apartment Building

[Moneyline]

I just went down to my apartment lobby to get Saturday's mail and a bum was rolling on the ground in the outer lobby. He looked to be some combination of high, mentally disturbed, and in agony. The door from the outer lobby to the main lobby is locked, so he's stuck out there unless someone has the good sense to let him in.

He's too frisky for me to want to communicate directly with him. So what's my move here? Call the police? Let him keep rolling around until someone from my building tries to come in through the front door? Or something else?