'When Calls the Heart's Erin Krakow and Chris McNally are spilling everything about Lucas Bouchard's proposal to Elizabeth Thornton in the season 9 finale of the hit Hallmark Channel series. ET's Deidre Behar asks the actors all about the enchanting scene, including what it was like filming on set, what was improvised and how Little Jack (Hyland Goodrich) enjoyed being part of the sweet moment. Krakow and McNally share what they envision for their characters moving forward, as they await news of a season 10 pickup. They reveal if they want to see the couple elope or have a big wedding. Plus, they share if they think Elizabeth and Lucas will have kids together. As for Nathan Grant (Kevin McGarry), they reflect on their characters' evolving relationship with the town Mountie who once pined for Elizabeth’s heart. They also weigh in on Nathan's love life, as he could pursue potential romances with Mei Sou or Faith Carter.