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I bet that if you let go , and you were that high up , the knot would have grabbed. You always check your knot and do a sit test , but the knot still failed ? Than I'm going with operator error here . You could have held a bite and fixed your knot , if you can do it five feet in the air you can do it fifty .
Back in the early 90's B. Weber was doing traing around the world . He needed a couple crash dummies to free fall on the prussics , Whad up ? So me and my buddy volunteered . ( we had a couple screws loose)We would footlock up forty feet with a four wrap prussic and just let go , tied it loose tied it tight some falls were longer than others , but they all eventually grabbed. My point is , I wasn't there when your knot"failed" but I don't care how you tied it I'd bet at that distance if you let go it would have grabbed , it be a cluster knot , but it would grab . You would be fallen so fast the knot would not be able to catch up with you , try it . I mean trust it .
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You would actually bet if he let go the knot would have held? Bad advice there. You should edit that post and remove that line.
I watched my close friend climb above his TIP with a VT once. The knot splayed open, he went back to sit on it, and he fell to the ground, 20' below. You should not assume it will ever catch. At least if you do not have plans to go home in once piece.
That is a very bad bet.