SPOILER ALERT: Do not read unless you have watched Apple and A24’s “The Tragedy of Macbeth,” which is now playing in select theaters and streaming on Apple TV Plus. In “The Tragedy of Macbeth,” Denzel Washington plays the titular Lord Macbeth — a Scottish nobleman whose last grasp at power ultimately leads to his downfall.In addition to memorizing Shakespeare’s powerful soliloquies (“It this a dagger which I see before me, the handle toward my hand?”), the Academy Award winning actor and many in the troupe, including Corey Hawkins (Lord Macduff) and Alex Hassell (Ross), were also required to brush up on their dueling skills for the production, adapted and directed by Oscar-winning filmmaker Joel Coen.