NICE SHOT............I BELIEVE THE "RED DOT" IS REALLY SUNLIGHT SHINING THROUGH THE WOUND HOLE FROM THE BACK..........OR JUST A REFLECTION OF THE PELLET (FROM THE SUN) JUST BEFORE IMPACT. TRY DOING IT AGAIN.......GOOD LUCK. HEDGE
Perhaps, Discharge of static electricity at impact site ... It it so bright and sudden, so little kinetic energy your not opening a hole you can see threw either.
While a WAG ... nothing else adds up, Very odd indeed !