Sean O'Driscoll admitted he was "stunned" by the decision to send Dexter Blackstock off as his Nottingham Forest side lost 1-0 to Derby in a bad-tempered East Midlands derby.
Just 32 seconds into the second half referee Robert Madley made the game-changing decision to dismiss Blackstock for an apparent elbow on Rams captain Richard Keogh.
"It came so quickly and there are aerial challenges all the time in the English game so I didn't know what it was for. That's the difficulty, when you don't know what it's for," O'Driscoll said.
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