What’s better than one GST staff writer’s perspective on a film? How about two? For this round of Double-Take reviews, Bill and Andrew crack their knuckles and dig into David Ayer’s latest street cop drama, End of Watch: By Andrew Crump: If insanity can truly be defined as doing the same thing over and over again while expecting different results, then Einstein would’ve immediately pegged David Ayer as a bona fide lunatic. Since his runaway success with Training Day in 2001, Ayer has done nothing but write and, more recently, direct crime films set in Los Angeles at large or South Central in the specific, crafting narratives that are embedded either…