KASSON — Emily Olson has a calm and quiet demeanor, the kind of person who goes about her business with focused determination and little outward emotion. Unless she's in the circle. The Kasson-Mantorville High School softball senior ace certainly flips a switch when she toes the rubber. "She's super competitive," her catcher, Grace Roethler, said. "Super competitive." Coach Paul Mann has had a front row seat to this side of Olson since coaching …