DALLAS — Mansfield Legacy is headed to the Class 4A Region II finals for the first time in school history, and Broncos standout Cole Hearrean happily proved coach David Walden wrong.Legacy rallied from a four-run deficit, with the big blow being a three-run homer by Hearrean, to earn a 6-5 victory over Prosper in Game 3 of their semifinal series Saturday at Dallas Baptist University.Legacy, which opened in 2007, upped its record to 29-11 and will face Hallsville in the next round. Prosper finished 29-12-1.“We’ve made history,” Hearrean said. “It is the farthest any team in school history has gone in the playoffs. Now we got to get to state.”The Broncos trailed 5-1 before scoring four runs in the top of the fifth. Marcus Perez and Dalton Dunn hit singles ahead of Corey Murray’s double that drove in a run. Hearrean then hit a monster shot over the 16-foot fence in left field.Right before Hearrean’s shot, Walden had called him over for a conference.“You could tell he was trying to hit one out,” Walden said of Hearrean. “I told him there was no way he was going to hit one out in this park. I just needed him to drive in a couple of runs.”Hearrean said, “I knew I had a big hit in me. I knew it was going to be close because I got it good. I was just hoping it was going to hit the wall or be a hit.”An inning later, the Broncos scored the winning run. Singles by Karson Houston and Chad Watkins, plus a walk to Perez, loaded the bases with one out. Houston scored on a fielder’s choice by Dunn.Hearrean earned the win by pitching two innings of relief. The Broncos had to sweat it out, however, as Hearrean walked the based loaded in the bottom of the seventh. Blake Wilson relieved Hearrean, getting a groundout to second to end the game.