Russell Westbrook is an emotional guy when he steps on the floor and that showed a little too much in Game 4. During a timeout or some sort of break from action he was talking to the fans near his bench and he was not happy with one dude. To be fair, Westbrook had been talking to the guy's wife and this was in Dallas so the fans weren't exactly friendly ones. But that doesn't excuse this kind of language.
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This is supposed to be a family-friendly environment, sir! Westbrook was issued a $25,000 fine for throwing around the f-word at fans.