You’ve probably already seen the video if you weren’t watching Monday Night Football when it first happened. Steelers star ILB Ryan Shazier, making a tackle on Bengals WR Josh Malone, fell to the ground on his right side. But instead of getting up, he grabbed at his back with his left arm and then used his upper body to turn onto his back. And then he lay there…while teammates kneeled around him, while fans wrung their hands at home, and finally while the trainers brought a backboard and the cart. All the while, not moving his legs.