One can never be 100% sure but I suspect Maguire intended to put his foot down on Broja's leg but knew how to make it *look* accidental. To my mind, the giveaway was that he didn't do the 'looking back and putting his arms in the air' innocence act that players do when they realise they've accidentally trodden on someone's leg. When you accidentally tread on someone's leg you know you've done it and your natural reaction would be to turn around and check the player is ok. Maguire did neither. A cleverly disguised deliberate act IMO.