You didn't ask if it's possible to have a knot perform the same tasks (break an uncontrolled descent) without friction, you asked if there were any examples of

You didn't ask if it's possible to have a knot perform the same tasks (break an uncontrolled descent) without friction, you asked if there were any examples of such a knot. Is it possible? I can't rule it out. Are there existing knots that do so? None that are commonly known, no.