From Sky News:

“Then I grabbed the AK (assault rifle), which was at his feet, and started muzzle thumping him in the head with it.”

Mr Stone was cut by the attacker behind his neck and his thumb was nearly sliced off as the man was wrestled to the ground by the Americans.

Mr Sadler, who also helped to subdue the suspect, said: “The gunman pulls out a boxcutter and slices Spencer a few times.” He added the attacker “never said a word”.