Yes, another reason stop shots are easy is that longer shots (with greater speed) are more forgiving.I think this is the main reason a stop shot is relatively easy at all distances (in addition to the fact that we practice and play them often).
The CB has a small amount of top/bottom spin over a fairly large distance, especially with faster-speed shots, and the CB stops within a very short distance (or no distance at all) with a small amount of spin (or no spin).
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