So this happened today two doors up the street from me.
He's very lucky. He didn't have a single scratch on his hide. I chalk that up to the (non-foldable) ROPS and his wearing of his seatbelt.
It's a John Deere 2210 that suffered very few injuries. He was mowing up and down the slope, did something else for a minute and took it out of 4x4. He went back to the slope and headed downhill. The rear wheels started slipping and down he went. He nose-dived right off the 3' cliff, slammed into the ditch and rolled to the left side. His seatbelt kept him from getting pinned or thrown over the tractor before it could have landed on him. It was super humid and the grass was damp at best. He is a lucky man. That much I can tell you.
I came over with the 2720 and used my Artillian fork frame, 2 of Kenny's Oblong Ring Slings, and some chain. We righted the tractor and towed it back up the hill to his home for further inspections and repair.
He needs a new radiator, a hazard light assembly, one of the "P" lifting links for the mower, and a good washing. His hood has a slight dent just above the headlight. Overall he came out of this relatively ok.
A quick order to GFP and a beer or two, and we'll have him back to mowing in no time. I think we're going to install some new front tires too.