My best guess based on the video is that the P-63 pilot had been high and out of position in formation, and tried to get back in position using both geometry and speed. He may have recognized that he had too much closure and wasn't in position to safely underrun the B-17, and tried to bank and pull to get safe lateral separation, inadvertently putting himself into a blind lead turn where he wouldn't be able to see the B-17 through his wing or fuselage. The blind lead turn is an incredibly dangerous maneuver in formation flight--typically prohibited in military air combat training--for obvious reasons.

Look at the cockpit view from a P-63 Kingcobra. No chance.

https://www.detailandscale.com/wp-content/uploads/2020/09/01...

Seems the opposite to me, but I'm no pilot. The smaller plane was making a banking left turn. Even if the B17 we're visible on the lower right side of the cocokput, the pilot was probably looking to the left where they were headed.

That is my thing, how can this happen. I had to google to see if this was true:

https://www.npr.org/2022/11/12/1136307205/dallas-airshow-bom...

I feel bad about the pilots, does not look good any survivors.

Or not? It's in a banked left turn, and since it was a collision course, the B17 would have been "under" him out of view. I would not complete the maneuver if I couldn't see it though, so who knows.