Originally Posted by
finestkind
You may as well just have a static display.
It appears to be a loss of SA.
My condolences. A terrible accident and I would have to agree with finestkind that loss of SA looks probable.
Either a formation join gone badly wrong, or the fighter, being belly-up in the turn, lost track of where the bomber was. Less likely, but pilot incapacitation is also a possibility.
I think formation training, experience and recency would be one of the first things the investigators will look at. A terrible loss and I hope the hard lessons can be learned without the FAA choosing the easy path of bans/boring displays like we've done in Europe.