Luck’s preseason debut: Three touchdowns in four possessions

We’re nearing the end of the first round of 2012 preseason games. And it’s probably safe to say that, so far, no NFL quarterback has made as strong of a first impression as Colts rookie Andrew Luck. Playing 24 snaps in Sunday’s exhibition opener against the Rams, Luck completed 10-of-16 passes for 188 yards and…