Looking at the videos, I was wrong about the clouds. One thing I do remember clearly was that I anticipated the collision just before they bottomed out in their separate loops. I don't know why but it just looked wrong. I was a long way back from the display line so had a wider view of the whole scene. My son was somewhere closer to the action and my immediate concern was that he wasn't hit by any wreckage so my attention was focussed on the falling bits of Mig29. My friend said something about them both being out and it was only then I realised I hadn't thought about the pilots at all.