Excellent question. The loop will most likely end up being hip height. Once you are upright, if all the weight is in the loop and the live end of the belay, or the tail that allows the loop to become either bigger or smaller, is not controlled, you will create more slack in the loop. You can try sharing weight between the foot and the hands to keep the loop the same length. In the demo video, Lydia leans on the belay loop sideways away from the live side, keeping pressure off of the live end so it doesn’t slide any further. There is little pressure on the loop while she preps for the knee drop and once the hands release from above the belay loop, they catch both tails to keep any new slack from occurring. Not much rest for your grip to really keep the loop from sliding open! Keep us posted!