Tannehill responded to Luck's early score with his fifth passing touchdown of the season, a 31-yard connection to Charles Clay that made the score 10-7.
On the next drive, Luck connected with Donnie Avery on a 48-yard bomb down the middle of the defense to put Indy on the threshold once again, but the Colts couldn't convert and settled for a field goal that tied the score.
Reggie Bush answered the call for the Dolphins on the next drive, scampering into the end zone for an 18-yard touchdown that featured moves reminiscent of his days at USC.
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Bush has six carries for 26 yards and the score.
Right before halftime, Luck once again connected on a deep pass and the Colts converted another long field goal to cut the score to 17-13. Luck is 19 for 28 for 273 yards and touchdown. A healthy-looking Tannehill is 10 for 14 for 158 yards and a touchdown.