Nah, he was diving for the ball.
Sherman got there so early that the ball was just touching Carpenter's foot near the ground at the time of contact, so it looks like he is going for the knee or foot or whatever.
He's just reaching down to the ground basically to get the ball, b/c that is where it was at that moment.
They are usually stretched out and diving into empty space to block a punt b/c that is the best they can do to get a piece of the ball, which has usually already left the kicker's foot.