There was a picture online somewhere of a rider practising one of the lines at a World Cup XC in Australia, it had a guy standing next to it watching as well. so you could see the angles of the terrain.
Proper mental nearly vertical drop, limited run out and the guy was riding it on the usual 18lb XC HT, saddle fully extended. It looked like a smaller steeper version of The Slab at Dalbeattie except with bigger rocks in the run out zone…
Watching pro XCers is incredible – Absalon at the Olympic Test Event was SO smooth (and that course is really tough, much harder than it looks in pictures).