Last year right before the 24HHH comp I purchased an 8mm static line for ascending, photographing, and getting myself around during the comp. The only problem was the rope was too short and I found myself having to to multiple raps or down climbing in order to get off cliffs.
So this year, in order to better prep myself, I ordered a spool of 9mm Static from Mammut. I cut it into a 70m and a 30m rope. This, I figured would be ideal for just about anything I would encounter. the 70m could get me down from anything and the 30m would work well for fixing single lines to shoot.
I really wanted to shoot Love Slave during the comp, so in the later evening, I scrambled some low 5th class and fixed the 30m to a tree and rapped over the edge to set up for the next climber to do the route.
I was satisfied with the position, the rope was on a rolling edge with not sharp angles. I set up a strobe on a stand that I would trigger remotely via Pocket Wizards.

I started jugging with a set of Jumars and a single aider. The route is only about 30 feet tall but I while ascending the rope, I noticed some heavy fraying up above. Thinking it was just fuzz, I continued to jug to where I wanted to be and shoot the climber on the route as he sent the climb. Looking up again at where the rope was running over the rock, now closer, I could tell that things were not looking great on the rope. I decided to not wait for someone else to come along to climb the route and tried to determine if I should rappel down then go around and climb back up to get my gear or just finish ascending.
Figuring that I was already 25 feet off the ground in some questionable situation, I said F-It and slowly finished ascending the rope and got my weight off of it. -- I mean why not, the rope didn't snap yet, right?
I definitely didn't like what I found upon unweighting the rope. With only 30 feet of jugging, the rope had completely worth through the sheath with the core exposed all the way around. Yay!

So my question is this: What was my error?? OR Mammut sheaths only tough enough for grade school dodge ball or perhaps a feisty makeout session on a gravel parking lot? What gives?
Setting up over a rolling edge on the line? Was it a problem with my ascending rig? Does God like to play mind games with me? In the thought of rigging, the only thing I could think of was since I was using only one aider step, was I bouncing more than I should have been - of course causing more rubbing? - I have been in very similar situations with my 8mm line, and the outcome is much better with almost no sign of wear on the rope.
Well, since I didn't fall yet, and I was still on a cliff; I used the line to rappel back to the bottom anyway! I accepted failure and possibilities cataclysm earlier in the day - so why not.
I am questioning whether I should use the good 70m line I have left. I know Mammut makes some killer equipment, but rubbing to the core on a 9mm line in 30 feet isn't exactly making me want to rub bellies.
Images from my week at Horseshoe and 24HHH to follow soon.