It’s a deeply emotional scene. The last lesson passed down from a teacher to a student. And Tilda Swinton ends up being the ideal choice to play an ethereal, knowledgeable being like The Ancient One on screen. There’s so much about her character that we still don’t know, and it’s kind of a blessing when we saw her resurface in Avengers: Endgame thanks to time travel. I also feel like she can contribute to the Doctor Strange sequel, because magic! But you knew, in this scene, that Strange would continue to learn from The Ancient One even long after she was gone, because her wisdom was that influential.