Director S. Craig Zahler, who has been making genre audiences squirm since his ultra-violent Western Bone Tomahawk in 2015, is back with Dragged Across Concrete and he's bringing Vince Vaughn and Mel Gibson along for an undoubtedly bloody ride. Collider is happy to premiere the first trailer for the film, which sees Vaughn and Gibson as two suspended cops who find themselves over their head in the shadowy criminal underworld. The film is a reunion for Zahler and Vaughn, who starred in the filmmaker's 2017 prison drama Brawl in Cell Block 99. That was a tough film …