On Sunday night's newest episode of Starz historical drama Outlander's, "The Ballad of Roger Mac," the Regulator Rebellion reaches an unavoidable boiling point. Brianna (Sophie Skelton) remembers certain details pertaining to the upcoming battle, and it puts her husband, Roger (Richard Rankin), into a situation of grave danger as he crosses behind enemy lines. During this 1-on-1 phone interview with Collider, Skelton previewed how this episode marks a real turning point in Season 5, revealing why “hearts are gonna be broken,” the careful consideration Brianna has when it comes to knowing the history of what’s …