Duration Of Fire
Rmventuri. Jammed guns/out of ammo?
More likely out of ammo. Can't remember duration for .303 or .5s. but read recently that the Mustang 's duration of fire was only twenty seconds. Not the minutes, for which the aces on film keep their finger on the button.
During instruction on air to air gunnery, we were taught 'wait til you see the whites of their eyes' ( below 250 yards), and don't waste ammunition.