I think it depends on the severity of the push/hit. And there is a bit of a difference between the sideline and the end zone. On the sideline there are a lot of bodies and equipment that can injure a player that is pushed/hit as opposed to the end zone where it is pretty much void of those obstacles. I think a significant hit or late push that sends the player out of the end zone into obstacles would generate a flag. There wasn't much to Price's push.