SEATTLE — Old habits die hard. That was the case for the Broncos’ defense on Sunday. Denver played inspiring defense in the first half, recording an interception and two safeties, only to see that effort come crashing down on the Seahawks’ first drive of the third quarter. In six plays, Seattle ripped off 66 yards, culminating with running back Kenneth Walker cutting right, shedding tackles from inside linebacker Alex Singleton and cornerback Riley Moss and leaping into the end zone for a 23-yard touchdown. The Broncos vowed to improve their run defense this offseason after being among the worst in the league last season.