He was scanning the police comms. And then, when pushed went into a fake, over-acted fall. But most telling was the quantity of blood that instantly pours out of the ear. That just doesn’t happen like that and, if it did, every single person it happened to would be dead.
Notice how the person filming this doesn’t catch the final part of the fall. Setup. Any person filming this by accident would have followed the guy to the ground. Instead, this camera person stays focused on the police the perfect amount of time to miss it.