Replying to The physics of huge urban drops to flat?

this season i plan to drop some east coast cliffs (cliffs with no pow, and a flat, hard, barely snowcovered landing) and i was wondering uhh if i drop a 15 foot cliff with the speed a 10 foot banshee bungee gives you (not alot) to flat how hard will the landing feel? After watching cam rileys segment in network i wonder how people land on the flat to concrete from like 15+ foot drops? In some edits i notice people build small cheesewedges in there landings to land on to decrease the shock, does this work? How do people not like compress and break their legs by doing such huge drops?