A defensive ten means the 7 (loss of 0 or 1) becomes a 6 (loss of 1, 2, or 3), AND any dice that would have been bonusable are now not.
The rush finds its way into the backfield for a loss of...
(1 or 2 = 1 yd, 3 or 4 = 2 yds, 5 or 6 = 3 yds)
Original Roll String: 1d6
1 6-Sided Dice: (4) = 4