Avengers: Endgame - 10 Behind-The-Scenes Photos You Must See
4. Okay Thor, Listen Up...
Day 1 of “going for the head” practice... pic.twitter.com/4svcrztFId
— Russo Brothers (@Russo_Brothers) May 7, 2019
Clearly, Thor needed to take some lessons after failing to go for Thanos's head, so co-director Joe Russo kindly provided him some.
Those lessons clearly paid off when Thor decapitated Thanos in the first 20 minutes.