So I bought this based off of recommendation and for the darker color. Well, I was testing it out behind the house one evening, using it in single rope setup with the rope wrench, and I decided to zip down the line rather quickly to work my landing accuracy on branches. Afterwards I noticed this on the rope and only in this one spot...Ive never had this happen to any other rope that I've owned. Could a defect have caused that? Or just user error? Any ideas?