This entire issue should be with the rule. If you want it to be conclusive that change it from the cross bar to the player's shoulders. Simplify.
On the account of replay, it should be used for BLATANT violations. As soon as you start doing frame by frame you are removing the human element of the game and thus why even have them? Give the refs a chance to watch it 4 or 5 times again in real time. Unless it's obvious, boom...call on ice stands.
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