Preview to How to Transition from Rappelling on Two Climbing Ropes to Ascending the Ropes
When climbing multiple pitches, you may end up having to perform multiple rappels. That adds in risks such as rappelling off route, past the anchor, or getting ropes stuck as you pull them. Any of these scenarios may demand that you ascend the rappelling ropes. The full video demonstrates how to switch from rappelling to ascending when you are using two strands on rappel.
Follow this link to the full video and accompanying blog post.