Coventry boss Mark Robins says he was confused by the decision to book Cyrus for tripping a pitch invader.
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A fan ran onto the pitch in their Johnstone's Paint Trophy northern final first leg 3-0 loss to Crewe, and Robins supports the defender's actions.
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'' He stopped the fan in his tracks and waited for the stewards to remove the supporter '', Ronus told BBC Coventry.
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He added : '' He stopped the fan from running all over the place. The fan had better movements than some of our players today ''.
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Two goals from Newcastle loanee Bradden Inman and one from AJ Leitch Smith at the Ricoh Arena saw Crewe take a three-goal advantage going into next week's second leg, as the Alex look to reach the final of the competition for the first time.
Fans should also learn to behave themeselves in games.
Its annoyin.