The Janitor

When the janitor left Terri behind to call the security he was in so much rush that he didn’t even see the police car which was already moving towards Terri. It was later the janitor saw a policeman coming out of the car while he kept looking at Terri from the glass with the phone on one of his ears. He was talking to the security and later told them not come as the police have already arrived. But why didn’t he come out?