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- assuming that this was accidental, then the P-63 seems to be working towards a rejoin of the P-51 and other preceding little friends, and that puts the line of sight for the pilot of the P-63 above his head, and to the left, well away from Texas Raider's. I would think that target fixation on the rejoin of relatively hard to see aircraft against the ground background may have distracted the P-63 pilot from his basic requirement to keep clear of what should be obvious traffic that he/she is overtaking.
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Looks to be a strong possibility. Looking at the satellite view of the likely “background” the P-63 driver would have seen behind the B-17 shows a dark green wooded area.
Looking at the curving closure approach of the P-63 towards the B-17 may have presented the B-17 as almost stationary and ‘invisible’ to the P-63.
I base my thoughts on this video apparently taken from “Square 67 Shopping Center 6210 US 67 Frontage Rd Dallas, TX 75237”