Oilers' Zack Kassian knocked unconscious in 'scary' preseason fight with Canucks' Zack MacEwan | CBS Sports Headlines Oilers' Zack Kassian knocked unconscious in 'scary' preseason fight with Canucks' Zack MacEwan Kassian’s helmetless head hit the ice midway through the fight, causing him to lay motionless for a few moments ESN … Continue reading Oilers' Zack Kassian knocked unconscious in 'scary' preseason fight with Canucks' Zack MacEwan