[ In Zelda's case though it's not so much the contract part she walks in on as the silent pray-kneeling. She looks... quizzically at it for a long moment, but is more than polite enough to not interrupt that. And also not to stare, even if it does prompt her to want to ask questions. Instead, she just lingers in the area, instead speaking with her Beldum while glancing back repeatedly at Shirou, waiting for him to finish.
... And then maybe she runs into the contract part who knows. ]
in which a dude tries to pray and everyone interrupts him
... And then maybe she runs into the contract part who knows. ]