Ya those three define E5. Hell ya might even call that Antarctic Shackleton shit New Wave E5. Or that guy in Selkirks a few yrs back hit by avalanche while snowmobiling, both legs broken, crawled on snow pulling self with chin and 1 arm for 18 hrs straight to train track, along train track for 6 hrs, then just barely was not hit by train when they saw him and stopped.
I think the scale went something like
E1: blisters, late, rain, bug attacks, snaffles eat horsecock etc.
E2: as above but unequipped bivi, OR, had to leave $100s of gear behind to escape
E3: ditto but lost, OR, serious injury
E4: injured AND lost, unequipped bivi, no food, outta gear, bear attacks, etc.
E5: touching the void/ You arrive back to your own funeral.