The Last Shadow Puppets (photo: Brittany O'Brien) When did Alex Turner deviate so far into the beaten path? He flirted on the last Arctic Monkeys album cycle with the slick, snobbish “old school” rock n’ roll stereotype that has defined him since AM became the first “rock” record of middle-schoolers nationwide. And now that initial inclination has developed into a full-grown relationship, but not a healthy one. It’s one that has subsumed him completely into a shadow of what he once resembled. Turner has long worn a variety of faces — the fresh-faced British chap, the acid-dropping stoner poet — but [...]