Evening all we done a track day at croft today in the 172 and had a slight mishap lol

Sarah over took 2 cars down the back straight and suddenly the car cut out, she bumped it off in gear but it sounded horrendous (rattling noise) and had no power then proceeded to cut out again. Car won't even turn over now just clicks when you try start it, also if you put the car in gear and try move it its seems like its seized solid. I personally think its spun a shell and locked up but does anybody else have any ideas please?

Cheers