And, without pulling the trigger, he had to have been holding the action release open in order to repeatedly cycle the pump action.
Obviously, his range time was not spent in scenario shooting exercises, or stressed shooting exercises.
Just standing on the firing line, shooting round after round, is great for acclimating to recoil, working on sight picture, and so forth.
If you are working to improve your stress reaction and response, try running wind sprints up and down the line, and then putting double taps in the X-ring. Have a range buddy load up a dummy round somewhere among the live rounds for your next magazine, then shoot a series not knowing which one won’t go ‘bang’. Go shoot at night, and take along a couple of flashing lights or strobe lights.
Set up realistic scenarios to gain proficiency with your concealed carry rig.
Spend time in the stress environment you expect in a life threatening encounter. That will build proficiency, and stress tolerance, that may very well save your life.