NASHVILLE—Mike Mancini skipped up to the batters’ box and took to the sky. By the time he’d come down, he’d emphatically stopped on home plate and was on his way to the Vanderbilt dugout.  As Mancini approached the top step, Vanderbilt center fielder Rustan Rigdon awaited him and offered him a near-mandatory chest bump. Rigdon was expecting Mancini to embrace him, but he appeared to be surprised by the force of Mancini’s jump and had to catch his balance as he landed. Mancini says that he bumped Rigdon hard, but is more focused on the height of his jump. That, he jokes, is high enough for him to dunk a basketball and could challenge former Vanderbilt tight end Eli Stowers –who broke an NFL Combine record with his high jump.  This is the look of stardom these days for Mancini; an upbeat nature, a general lightheartedness and a whole lot of individual moments worth celebrating like he did on Tuesday night.…