I was under the car in the motor club at the time. I'd popped out to watch the Dutch F-16 practicing before the Phantom.
Back under the car, and I heard a boom - look out thinking the Dutch idiots gone supersonic, only to see the fireball .... only found out it was the Phantom later.
If you ever saw the accident report, there was a picture of the impact point on the grass - almost a perfect imprint, apart from fwd of the intakes, where I guess he'd got the nose up.
A real tragedy.