Amazing that the pilot survived without ejecting. Sad that others have not been so lucky, he's going to have a very hard time getting over that.
Watching a few videos its not clear what went wrong, he seems to have partially stalled at an unexpected time and couldn't see a way out, perhaps he wanted his nose a bit further up before whacking full power on to get out the stall, it takes a lot of bottle to go full power when you are still pointing at the deck at low altitude. The top of the loop didn't quite look right for the type of aircraft, perhaps there was a fault on the plane.
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