It doesnt seem much like a restoration to me, even though it would be impossibly difficult to tear the top off a balloon, you made no effort to make it even appear that you did. That being the case, you now just invented detach, but instead actually using the method that we all immediately thought of the first time we saw it.
I'm blanking on the name of the trick or performer, but I know I've seen someone pull the knot off an inflated balloon then reattach it. Probably been done a bunch of times, but I have only seen it once.