At the start of the video (from the recorded track) lots of hit effects, barrels firing on Spitfire, Sounds and Smoke effects + Particles off the enemy aircraft.
Later in the Video/track no Gun-Sounds, Barrel Firing or smoke effects from Spitfire, no-casings or any indication that the aircraft is firing. Also no obvious hits on the enemy Aircraft like you see at the start of the video/track.
The enemy aircraft then explodes (from hits off the Spitfire, but there is no indication it is shooting).