Okay, I get you, but he's also in the airport. Has he gone through detectors if he at the "car park meter" as it was put earlier? What possible weapon can he have?
He gets kicked in face and stamped and the officer backs away. At what point does he perceive a possible "threat" in order to complete these actions? I would expect him to jump on the 'perp' straight away. I think he knows the male has no weapons as he's been involved in the fracas beforehand.
None of his actions make any logical sense, but it does show complete lack of control and reactionary behaviour.