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Personally I think the Welsby one was a bad one, looked clear direct shoulder to head and he should probably have seen red in the game. If they don't ban him then they may as well come out and say they don't care about player welfare. 6 inches down and it would have been an awesome hit, but it wasn't.
Knowles has to serve at least a couple of games for that, it's the sort of hold the police put you in to restrain you and he knew exactly what he was doing.