There's no vibrating glass or electric current. [ Subaru pulls her hand away. ] I don't think this is Sentience's doing, either.
But... you said it happened after you were thinking about them, right? Maybe... [ Subaru closes her eyes, pressing the palms of her hands back to the cool reflective surface again. Her thoughts drift toward home easily, but despite that, nothing seems to be happening.
...not on this mirror, anyhow. The one lining the wall to their side, though, has begun to display the a cozy scene: a girl with orange hair (albeit longer and not tied up as in the image) being led into the abode of what is no doubt the Nakajima household. ]