Passing Knots When Rappelling (5 Different Ways) 

1. Using the adjustable cow's tail on the handled ascender
2. Valdotain Tresse (VT Prusik)
3. Purcell Prusik
4. Chest Ascender (Rope Access Style)
5. Regular Prusik
Corrections:
2. I grabbed the VT a little too hard for a faster-than-desired release... sorry.
3. When using the Purcell, I probably could have stopped the knot to within about 2 inches of the descender, but I don't know if that would have mattered in my inability to remove the Purcell due to reach.
4. When showing the use of the chest ascender, I was using SRT & had no backup/belay in place. You should always have a backup system in place when working or rescuing.