something caused it to flip suddenly, while largely intact, followed by disintegration
'Expert' on BBC Radio Five has described the craft 'inverting' and flying backwards at supersonic velocity whereupon the wings were torn off (as they weren't stressed for negative direction travel) and the survivor was thrown free.
There was no 'explosion' other than catastrophic failure of the structure.
There is no ejection system and the pilots do not wear pressure suits - though they do wear parachutes.
Escape would be through a 'rear hatch'.
The deceased pilot was not thrown free when the craft broke up.