ST. LOUIS — Post Malone fell hard for St. Louis, literally, after he stepped into a hole that took him down in front of a packed house Saturday night at Enterprise Center. The singer, wearing a custom St. Louis Blues jersey, was performing “Circles” midway through the show when the accident occurred. During his Twelve Carat Tour concert at the Enterprise Center in St. Louis on Saturday night, the Rockstar hitmaker tripped over an area of the stage used to lower instruments while performing his song Circles. Post, real name Austin Richard Post, received attention from medics, and after taking a…