Tell us about yourself!
What's a land line??? ??
The problem that I see is a question with its ability to hold the knot. You have to pull on the cord that is above the knot in order to untie it. The same effect happens when you take a step, as soon as your heal leaves the ground. The Dorsal moves forward pressing against the shoe tongue and laces, thusly applying pressure to the area that releases the knot. Any ideas contrary to this?