I think replays can "possibly" be used like in a low blow situation.
Say a fighter claims to be hit and folds down, the ref. calls time and is immidiately shown a replay with a portable screen for him to see. Within let's say 3 replays (about 30 seconds or so) he should be able to signal a call. If in fact it is a low blow then time continues from the moment he called time and the fighter may rest.
But if the ref. finds the blow to be OK and NOT below the belt maybe the fighter can get a warning or something. Incase someone tries to use it to their advantage after 3 times that a fighter has claimed to be hit low and the ref. determines that he lied he can be deducted one point in the FINAL scoring.
(I dunno what I typed, I just went with it as the thoughts crossed my mind

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All in all some sports were not ment to have replays...
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