[usurper]

Looks to me like the P-63 lost sight of/never saw the B-17, which was below him.

I think they call it a "Mad Hatter" neither pilot can see the other.

[Texan4Life]

Video shows debris falling onto highway after 2 aircraft crash mid-air during Dallas WWII airshow

https://www.youtube.com/watch?v=yoaRphkTs6I

New angle of the mid-air collision obtained by @WFAA
shows B-17 and other aircraft flying formations at #WingsOverDallas at 1:21p today, when it was hit by a P-63 and fell to the ground over the airfield at Dallas Executive Airport (RBD).

https://twitter.com/JasonWhitely/status/1591541681798668291