Avengers: Infinity War - Predicting The Entire Plot In 20 Steps
12. Vision And Scarlet Witch Are Attacked
Quite where this happens in the film's timeline remains to be seen, but it's likely to come within the Guardians sequences. It's placement, though, is not all that important - what matters is that this will mark the first time any of the Avengers will come face to face with The Black Order.
Having learned of the Mind Stone's whereabouts (possibly through Loki?), Thanos will dispatch part of The Black Order to find Vision. They'll interrupt a romantic meeting between the android and Scarlet Witch, who has been in hiding since Civil War as they attempt to remove the Stone from his head.
This sequence - set in Edinburgh - will see Scarlet Witch and Proxima Midnight square off and Vision fight Corvus Glaive (who appears to get the upper hand). And were it not for the arrival of some familiar faces, things would turn out very grimly indeed...