I still can't believe we ran than zone man at the goal line against Seattle. I have never in my life played that kind of defense at the goal line going back to when I was 9 yrs old. You condense the D, and run cover 2 since the safeties can't get too deep and you have the middle covered. If the rush can't get to him then at least he has no escape route straight past a DB with his back tirned. You do not shift from zone to man because you spread everybody out and the dbs are in no mans land, if they play the QB the receivers get lost, play the receiver and your back is turned and you can't pass the man off.