Adam Vinatieri added a 41-yard field goal with 58 seconds left in the half, and Steven Hauschka hit a pair of field goals to start the third quarter and put the Seahawks in front 25-17.
That's when Luck and Hilton struck again, with the quarterback lobbing a beautiful 29-yard touchdown pass into the end zone to cap a 10-play, 80-yard drive. A 2-point conversion pass failed, and the Colts still trailed 25-23.
But there was no doubt Hilton had Seattle's attention.
"He's really, really fast," Carroll said. "We knew it going in. We counted on him to be a big-play guy. They got us with a little formation thing on the first one that we should've played fine, and then they just ran by us on the other one."
Hauschka added another field goal to push the Seahawks lead back out to 28-23 heading into the fourth quarter.
On the game-determining drive, Luck completed all three of his third-down conversions. The first was aided by a pass interference call against Sherman, the second was a 12-yard completion to Hilton and the last was a 3-yard pass to Reggie Wayne that was originally ruled short and overturned on review.
Luck hit Wayne again for 19 yards on the next play, setting up a first-and-goal at the Seattle 3. Donald Brown took the football the rest of the way for the go-ahead score.
"We knew the task at hand," Brown said. "We knew it was going to be a 60-minute fight. On paper, two evenly matched teams, and we just knew it was going to be a 60-minute fight. It was, and that was one heck of a football team we just beat."
Luck completed a 2-point conversion pass across his body to Wayne in the middle of the end zone for a 31-28 lead, and Vinatieri added a 49-yard field goal with 1:55 left for the final margin.