Stan was inside his car parked a block away from the building where Ben Franklin had gone in a few minutes ago. He knew of Ben's whereabouts through the text that someone had sent had sent Ben, asking him that they meet up. "It's urgent," the text had read.
Stan was surveying the environment from his car, all the houses in the area are fenced, including the one Ben had entered. He would have to scale the fence to be able to get in.
As he got down from his car, he saw a car pull up in front of the building. The driver's door opened and Trevor's mom stepped out. With the way she walked, it was obvious that she was angry.
Trevor must have told her of how Emily's disappearance might be linked to Ben, and she is probably here to confront him.
"Shit!" Stan quickly locked his car as he ran to meet Trevor's mom before she got to the gate of the building.