Well, I think he got sent off for "Serious Foul Play", which I guess is correct. Cahill did slide in with two feet and took the other player out, even though he was trying to stop the tackle part way through with his momentum just taking him through the player. The ref made no technical errors, so the red has to stay. Thing is, it could also well have been a yellow for another ref. As others have said, the ref probably had enough of his mouthing off, so a red seemed like the right thing for the ref.
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