Baker wrote:You down climbed?I'd guess alternate lanyard technique going down, just like going up. For a quicker descent the rope could be wrapped around the trunk like so, rappel with an ATC or F8 then pull the rope out from the ground. Would be a little challengeing to drop both legs to the ground cleanly to set it up but if there was a clear path as suggested it would work.

Could be done a few different ways going up and down. Guiding an unskilled climber you want to have a way to get to them quickly if they have any problems.
-moss