So a witness who is a 'non pilot with some gliding experience' attests to a flat spin and we all jump on the professionalism of the C150 pilot? Is this not a bit like the the tale of the couple recently who had their honeymoon ruined by the terrifying actions of their pilot... it was a Go Around.
Jeez guys, if you're going to bring into question the professionalism of a C150 pilot, don't do on the back of testament from a guy who didn't know what he saw.