What if they flipped the offsides rule from any part of your body in front of the defender is offsides to any part of your body behind the defender is not offsides? (hockey uses a fixed blue line for offsides. The puck has to cross the blue line first. A player is not offsides if any part of his body is on or behind the blue line when the puck crosses. So what I suggested is the way hockey defines a player being offsides.)