That's where I disagree, as I thought Duffy used his hands to climb on the defenders back. Yes it's soft for the Cardiff defender to go down as he was holding his ground, but there was certainly contact from Duffy before and as he jumped. I've watched the video back twice now, and I still can't...
*Subjectivley
Because when looking at it objectively, climbing on an opponent's back and holding him down is a foul.
You're all mad. It was a clear foul. The reaction from the Brighton players says it all!