Fortuna Dusseldorf's pre-season friendly against Benfica was abandoned after 43 minutes when referee
The incident happened as Fischer was preparing to show a second yellow card to Luisao's team-mate
Luisao approached the referee in a menacing manner and sent him falling backwards, where he lay for several seconds apparently unconscious before coming back to his senses after players and assistant referee called for a doctor.
Fischer got back to his feet and decided to abandon the game.
Fortuna returned to play a further 45 minutes without its Portuguese opponent, splitting its squad into two sides of 11 men to ensure the fans at the Dusseldorf Arena were given some value for their money.
Schalke director of sport