I'd say he handled it quite well. He shot to wound, disabling both men about as quickly as would be feasible. In the heat of the moment it is effectively impossible to tell most fake guns from the real thing.
I personally own several airsoft replicas. For most of them, the only external difference between them and the real thing is the inner barrel is a few millimeters too narrow. Trying to tell the difference when one is pointed at you is liable to get you killed.