Ambulance

I was in my apartment when I heard a knock on a neighbor's door. I looked through the peephole when i saw two policemen and two paramedics. The paramedics leaned against the wall next to the door on the left and one policeman of front of the door and the other policeman on the wall on the right of the door. They ask for the neighbor by his first name then he opened the door. They went inside. I was afraid because police came.  I gathered my keys and went downstairs until they came out with him. He had a blanket wrapped around him so he must have called them himself.  I am not sure what this was about but I know I didn't want to be around in case there were some shots fired. I noticed there were two police cars and one ambulance parked outside. What should I expect? Why did he call if he could walk out himself? Why were medics accompanied by police? I am not sure what this was all about but I know that I am concerned. I hope he is alright.