What they said, and to add that if you do it perfectly (I rarely do) you will not stall at the top, but rather come over the top just over your stall so that you still have control. Ideally the rope victim will come over the top in a stall while you are on the way down, and in the perfect setup, they will be flopping around helpless with their belly showing.
It can be done to any plane in any plane, but the good zoomers obviously do it better.