GLENDALE, Ariz.—Cam Newton took the snap on third down and it was like he’d never left the Carolina Panthers. The quarterback got moving in a hurry in his blue, black, and silver jersey, barreled into the end zone for a 2-yard touchdown, ripped off his helmet, and screamed “I’m back!” as his teammates celebrated around him. Superman maybe a few years older, but he’s still got a flair for the dramatic. “I’m just floating at an all-time high frequency,” Newton said. “It’s almost scary.” The 32-year-old provided a flashback to his MVP days in his second debut with the Panthers, throwing for one touchdown, running for another, and sparking Carolina to a 34-10 win over the Arizona Cardinals on Sunday. Newton—the 2015 NFL MVP who was signed by the quarterback-thin Panthers earlier in the week—made his presence felt on his first play of the game, entering on third down, running …