The recoil of a gun was a subject of the test and conducted by forensic experts.
Left photo showed a gun about to be fired by a ballistician using his thumb squeezing the trigger. The ballistician had extreme difficulty holding the firearm, and in squeezing the trigger.
Right photo shows after the gun was finally fired and the instant recoil of the gun was observed from the hand of the ballistician as the firearm “kicked backward.”
