Signs of Struggle?

We burst out of the front door ready to take on the new threat. We would have a chance to display courage, and perhaps make a good name for ourselves. We didn't see the mad prisoner or police officers when we exited the station. We circled the police station. Nobody was there. That in itself isn't strange, but there was no evidence either. No footprints. No torn clothing. Nothing. No signs of struggle. My theory was that even though there was no tape in the player of the control room we were still somehow receiving old footage. Olivia went along with it, but she said we needed to find him regardless. She said he's a madman and who knows what he's capable of.