You can tell by the reaction of their number 8, as the ref is reaching for a card that he feared that it must be a straight red for the challenge on Jack.
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At least the ref was consistent. Both could have gone and probably should have done. Did well not to respond to the the reaction of the Dartford players with Clarkey's tackle.
Clarke got the ball but was jumping in, and with two feet. Note that the ref blocked him for the previous tackle accidentally, maybe this effected his decision thinking perhaps he was partly to blame for that little phase of play.