What is the Bachmann Hitch?
The Bachmann hitch is a climbing hitch. The carabiner acts as a handle which can be used to break the hitch and reposition it.
The Bachmann Hitch, what is it used for?
The Bachmann hitch is often used in mountaineering and climbing when the friction hitch needs to be moved often.
Remarks
Do not use the carabiner as a tie in point, but attach the climbing harness to the Prusik loop.
It is recommended to let the gate of the carabiner face down to minimize the risk of unclipping.