Hillian1
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It DOESN'T matter. Chances are the ref didn't spot the slip and only saw Murphy connect with two feet, therefore correctly sending him off. There's a chance it might be overturned with the benefit of replays, but in real time I'd say the ref can't be criticised.
Pretty much all of this, every time I see it in real time, which is all I've seen, it looks all the world like a straight red.