As minuscule of a change as adding Doctor Strange’s gesture was in Avengers: Endgame, it was important in a couple of ways. Firstly, it effectively establishes his connection with Iron Man despite only briefly working together in Infinity War.
Taking it to his official Twitter account, Doctor Strange director Scott Derrickson reveals that the specific moment where the sorcerer raises his finger to Stark, confirming that it’s the one timeline that they’re going to win was improvised. As it turns out, Benedict Cumberbatch himself told him this that’s why he knows despite not being directly involved in making Endgame. Check out his full tweet below:
Benedict told me this moment was an improv. https://t.co/d5fvwTTrwl
— N O S ⋊ Ɔ I ᴚ ᴚ Ǝ ᗡ ⊥ ⊥ O Ɔ S (@scottderrickson) October 27, 2020
Being the only person who knew that this was Tony Stark’s fate, it’s interesting if this would be mentioned again in his future narratives — especially considering that no one else knew of this exchange other than them. Secondly, it also highlights how Doctor Strange’s hands never really physically healed despite his growing powers as a sorcerer. This was a nifty reference to his origins story.