Maybe we should think of hand checking in the same way as the definition of a "yield" traffic sign. You haven't "yielded" if you caused the other car to change its speed and/or direction. If you run the sign, but haven't caused the other car to change at least one of those things, technically you "yielded". A yield sign is not the same as a stop sign. The stop sign would be a good analogy only if we were supposed to call all hand contact as a foul.
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Yom HaShoah
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