Do Draken F1s have zero zero seats?
Jet appeared to be steeply rolled to starboard - possibly even stalled or on the edge of a stall - assume that spurt of flame was the seat firing - very low - outside envelope?
EDIT: it would seem so:
https://www.safran-martin-baker.com/...re%20redundant.
...and I should add, I'm not in any way implying blame on the pilot, just curious.