Paul Mescal has earned critical acclaim and award nominations for his performances in "Aftersun" and the TV series "Normal People." Now, the Irish actor who's become a Gen Z heartthrob is front-and-center of "Gladiator II," Ridley Scott's sequel to his Oscar-winning 2000 epic of ancient Rome.Mescal talks with correspondent Seth Doane about acting alongside such icons as Denzel Washington; and what he first felt on stage in a high school production of "The Phantom of the Opera."...