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If his prop actually impacted the surface, that is a bill of around £10,000-£15,000 if done properly (prop repair / new prop blades / whole new prop / shock load inspection). I hope somebody told him that he had a prop strike (he may not have realised) because engine damage can occur without obvious prop damage especially on grass. The next person to fly it might get a suprise. I would also contact the CAA-registered owner because many renters don't report awful landings, so the "suprise" the next renter gets may be a gear collapse.
On a more general point, most PPLs are not taught the full version of working out the aircraft landing/takeoff performance. I never trained in a 172/182 so don't know what documentation they come with, but then I never saw a POH for anything at all during my PPL training. What I now fly (TB20) comes with a very complete graphical diagram where you start with the OAT and airfield elevation, then move along to the weight (this gives you the Vr etc) then move on to the obstacle height etc.... If people were taught this, they wouldn't do what is described as often.
I know I go on about this but PPL training is generally c**p. The whole system hangs together only because nearly all PPLs chuck it in almost right away.