It was during the CAF airshow. I have seen other videos from a different angle, further away, show other fighters going through one behind the other in a trailing flight bath, with a pretty good spacing between. The B-17 was lower, probably on a simulated bomb run or something, and the P-63 was maybe 1/2 mile to the left flying in the opposite direction. He may have been a bit lower, and turned left towards the B-17 flight path. like he was supposed to be in a skating rink type pattern just flying consecutive ovals. By the time he got close to 180 degrees in the turn, He was on an intercept path. I'm thinking he couldn't see the bomber until after he hit it. It was in a left bank, bomber was in a blind spot. Some one deviated from their flight path or altitude, most likely the P-63 pilot. The bomber was flying straight and level it appeared to me. Bomber flight deck probably never saw the P-63. Pure pilot error, I think. You just have to pray for the crew families.
Type at you later,
Dan McEntee