The DB eyed Haener the whole way while Haener eyed the receiver the whole way, and the DB broke on the throw immediately to make the pick. If the ball gets there faster and/or if the QB doesn’t stare down the read, the ball probably doesn’t get picked. I don’t know why he would throw back shoulder against a DB who is playing over the top with cushion and good hip angle, although I’ll point out Haener makes a successful back shoulder throw later against man coverage that looked good.