Post History
He was demonstrating how to tie a Clove Hitch one-handed for setting up a belay when one arm is broken. The karabiner in the knot is to help release and untie it afterwards.
Answer
He was demonstrating how to tie a Clove Hitch one-handed for setting up a belay when one arm is broken. The karabiner in the knot is to help release and untie it afterwards.