Glad HT found the issue.
Funny collision bug exploitation story here.
Was in a 109-f4, diving on p51d, he reversed me then I reverse him. We then go into a flat scissors on the deck. As he flies over me I look to left and see him 250 out and turning back inside me. Sooo my only resort, pull up in front of him at 200-150 out and try for the collision bug. It works!! I spiral into the water having lost my wing. Talk about karma.