PITTSBURGH — Another fourth-quarter lead gone and another “what if” loss looming, Pittsburgh responded with a little bit of savvy, luck and a dash of redemption for its beleaguered defense thrown in for good measure to surge past struggling Georgia Tech. First, Scott Orndoff kept his head while hauling in a tipped pass from Nate Peterman the tight end turned into a game-tying 74-yard touchdown with 3:50 to play. Then nose tackle Tyrique Jarrett stuffed Yellow Jackets running back Dedrick Mills on fourth down to give Pitt the ball back with 1:47 left to set up Chris Blewitt’s bank shot 31-yard field goal as time expired.