Well nevermind then, back to the mechanical. I was thinking I could rappel on this and use my other hand as a brake hand. I was talking to my boss the other day (retired tier 1 SEAL). He broke a rope out and taught me to how to rappel by wrapping the rope around your arm, sit back, wrap your opposite thigh and the use both hands as brakes. He said they would rappel down a building like that, no knots, no devices, just a little rope burn if you are being shot at. That is my new self rescue technique.