A fairly short scene, The Man In The Church provides a little bit of a deeper look into the relationship between Pietro (Quicksilver) and Wanda Maximoff (Scarlet Witch) in [The Avengers: Age Of Ultron](tag:293035) and explains a little more about how they got involved with Ultron in the first place.
The scene opens with Pietro handing out books, clothing, toys and medicines to citizens of Sokovia, he hands a man medicine and says he doesn't need to worry about his insurance - Pietro is taking care of it for him. He gives a young woman a ball and tells her it's for her brother, then gives her an expensive looking dress and tells her that it's for her.
"Is every girl in Sokovia getting a dress from Paris? At least Gertie's looked warm." Wanda walks past and sarcastically enquires, scuppering Pietro's plans to get in good with this girl. What else are sisters for?
Pietro catches up with her and teases her about being jealous. Wanda warns him against stealing items for the villagers - pointing out that he may be fast but he can still get shot when he's standing still. Foreshadowing! They argue over strategies, Pietro is annoyed that Wanda didn't let them kill Tony Stark when they had him at Baron von Strucker's outpost and Wanda is exasperated by Pietro's impatience.
They are interrupted by the younger brother of the woman Pietro was talking to earlier, who says:
Costel: "The man says you need to come to the church."
Wanda: "What man?"
Costel: "The Iron Man."
Clearly this is a reference to Ultron, not to Tony Stark, but at this point the twins don't yet know of the former's existence and so appear confused by this remark. The scene ends here, so we don't actually see them then meeting up with Ultron, but that was covered in the film so it's all good.
The Man In The Church is a pretty throwaway scene, but it does bridge the Maximoff's narrative gap between the Hydra outpost and them joining up with Ultron. It also gives us a nice little bit of character development for the twins, with Pietro as this charming, Robin-Hood type character and Wanda as the more careful and level headed of the two.
Her sarcastic remarks over the dress and Pietro's subsequent enquiry if she's jealous that he didn't get one for her also might hint towards the Marvel Ultimates version of the twins, in which their relationship goes beyond the familial.
Yeah, that happened. And now Age of Ultron is ruined for you. You're welcome. It's not exactly anything explicit, but Elizabeth Olsen did say in an interview last year that both her and Aaron Taylor-Johnson were aware of this dynamic between the twins:
"In the comics, every time you see an image of them, they’re always holding each other’s hand and looking over each other’s shoulder. They’re always so close, it’s almost uncomfortable. Aaron and I have been playing a little bit with those kinds of images just for ourselves."