That analogy doesn't hold up for several reasons the least of which is the pedestrian never gave consent to be allowed to be hit by a car. Players in the NBA do give consent to be injured during a game if the injuries sustained occur as a result of the natural course of the game. And even if they're not they are still handled internally most times for various reasons. This is not a blanket exemption from liability but it does apply here. A more apt comparison would be someone getting sick on a roller coaster. It isn't the roller coaster's fault for causing the injury.