Was Katich out of line with Clarke ?

Have you heard there was an altercation between Katich and M. Clarke after day 5 of the recent SCG Test v Sth. Africa, apparently Clarke wanted to get the team song over and done with so he could go and met Lara for a drink but Katich took umbrage to this and grabbed him around the throat and had to be forcibly restrained by other players. In Clarkes defence this incident took place 5 hours after the game had ended, why wouldn't they sing the song as soon as they got in the rooms like AFL players do ?? 5 hours on the grog can do strange things to a man...discuss