What would you expect him to do? He may have been adrenalized? What,,leave the area? Clump down in a heap? He didn’t know who or what was around and he was probably in pain and trying to stay calm. Orbital blowout fractures usually occur internally, because the small thin bones that support the orbit are the ones that usually crack or give way. Just because he was standing doesn’t mean he wasn’t injured. He may have been in shock.
He appeared to be quite casually shooting the breeze with the other officer. I’m not disputing what you say, but he sure as hell didn’t look injured.
When I was a small child, my parents were in a terrible car accident.
When the ambulance arrived, my father was walking around the scene with a broken leg.