It was graded as severe impact, careless conduct and high impact.After the 90-minute hearing, where van Rooyen testified that he was trying to mark the ball when he collected Aliir, the tribunal jury deliberated for nearly an hour before upholding the charge.Melbourne had argued van Rooyen's attempt to mark the ball was not careless, but the tribunal rejected their case.Tribunal chair Jeff Gleeson KC also turned down a bid from the Demons to have a biomechanist give evidence for van Rooyen."The swing of van Rooyen's left arm constituted the act of a strike It was not simply a trailing or leading arm that Aliir collided with," Gleeson said in the verdict, adding the panel found it was careless."Van Rooyen was initially intending to mark the ball, but we find that shortly before impact, he ceased to intend to mark the ball