yesterday, i led a crack climb at skaha and my belayer was saying i needed to put in more pieces (i really hate that) and as he was following, he said slack! slack! slack!... WTF so i gave him slack... when he got to the top he explained that he had only tied a loose overhand knot and it came undone. he had to clip into one of my only 2 pieces that i placed and tie in. apparently, while he was putting on his shoes, he tied a loose knot so i wouldn't pull the rope too far. skeeeettttchhhhyyyy!