[Byleth played along with the deception, when the pair of mages mistook him as someone suffering from some sort of debilitating illness ("I ate something... unwise," he had bluffed when directly asked by them, and they had given him understanding yet judging nods), and so kept up the act until they were safely within the church, out of sight and out of mind.

...or, so he'd assumed, but he felt oddly on edge. The hairs on the back of his neck prickled, as they usually did before an ambush, some innate, animal instinct whispering caution, caution in the back of his mind. Nothing in his surroundings pinged as a threat, however. It just looked like any place of worship: pillars, atatues, and a solemn air that made him feel like he'd be scolded if he spoke a little too loudly. And if they were told to come here for healing, then there likely wasn't anything truly dangerous here...

But maybe they should exercise some caution. This place was incredibly strange and alien, after all. Who knows? They may be the type to boobytrap their Churches in case of strangers bumbling into their sacred places.]

Wait. We should tread carefully. This place gives me a sense of...

[He wasn't sure what the right word was. Creepiness? That sounded disrespectful. Threat? Hmm, not quite...]

...tension. Like the moment before an ambush. Do you feel it too?