PK, actually, I'd say Lee's just skipped the skips he used to get to that conclusion. Basically the problem can't happen if you have rethreaded and then a properly tied stopper, because the knot can't be arranged in the directions mentioned. Lee's just gone straight to the conclusion.
I'm going to be more paranoid about my stoppers on bowlines now (I alternate between Fig-8 and bowline), they're always there anyway, but I'll be doubly sure of them now. |