Feliya and Rendon have navigated the climb and descent from the Temple at the Peak many, many times now. It looks scary, but only if you don't know what path to take. There is no rappelling or climbing or anything special necessary, aside from preparing for the cold and training to withstand the thin air. Also, it is Korrado's domain, and He would intervene were anything to happen to His and His ally's acolytes.
That is why Feliya is very surprised when a sudden landslide causes them to fall to the snow-covered rock below.