I disagree with the people who say warnings are never effective, but in the OP, I think it's too late for a warning. If you thing the player can calm down and finish the game in an appropriate manner, an intentional might be a good call. But if the player is really getting out of control, or if there are more players on the edge, and unsportsmanlike T if no contact would be a more forceful statement. There's definitely a huge amount of judgment needed, and I think it pays to have plenty of experience either from your own games, or from watching others'.
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