Well as we know a German said to his British captors " When the RAF fly over, we duck. When the Luftwaffe fly over, you duck. When the Americans fly over EVERYBODY ducks"
I recall a Luftwaffe pilot saying, "Our own flak shot at us all the time."
I am sure if he could, George Preddy would echo your observation. "Butch" O'Hare too....
The pilots of 74 Squadron RAF had at least two incidents where they attacked RAF aircraft. Douglas Bader was probably shot down by a fellow allied pilot.
However in this case it's surprising that the Bf110 is not recognised.
K