lulz fail
Considering the results were never recreated, I call the entire thing fantasy.
One unit commander had succeeded in breaking up a four-engine bomber formation with a 1,000-pound bomb, and now the other units were beginning to train the same way, but without any success Under these tactics, a few aircraft were armed with single 1,000-pound bombs with time fuses, but in order to succeed the attacking aircraft had to climb above the bomber formation and measure the range in height accurately enough to ensure sufficient blast effect from the bomb. To the best of my knowledge, there was only one instance where a bomber formation was broken up through these tactics.
Johannes Steinhoff
The action in the film was the one instance where the break up occurred on July 28th, 1943. According to Knoke it was Fest that dropped the bomb and was awarded three kills from it, but there are conflicting reports on what actually caused the explosion and was possibly flak or rocket equipped 190s below.
“In addition to the Focke-Wolf 190s dashing headlong through our flight, and dodging the flak from the German anti-aircraft units on the ground, to my horror I saw bombs dropping down upon our formation from the sky above.”
Clifford Hopewell (onboard one of the bombers)
Granted, this action mentioned by Hopewell occurred in May, but it displays the chaotic nature of the battles.
edit: In addition, I find Knoke a completely unreliable source due to his questionable political affiliations. Not only during the war but even after the war he held to the Nazi beliefs.