When you rappel down, you loop the rope over your anchor, your fixed point up top, so in effect, it's secured in the middle of the line.
Shipton swore and began to fumble with his line to rappel again, down to the now injured and trapped form hovering below him.
Just rappel down and climb back up.
After his surrender in 1847 he devoted himself anew to theology and philosophy, and composed a philosophical treatise, of which a French translation was published in 1858 under the title of Rappel d l'intelligent.
He closed his eyes briefly and began loosening his tight grip on the line, readying himself to rappel downward.
You'd just loop your line through a set up or a fixed anchor and rappel down.