“This is an example of illegal contact in the post. The defensive post player, Kelly Olynyk, reaches out and illegally grabs the back of the jersey of the offensive player, Jabari Parker, as Parker makes a move toward the basket. This illegal shirt grab impedes his opponent’s progress, and it is a defensive foul. A defensive player may not dislodge or re-route an offensive player, nor may he impede an offensive player’s progress.”