"Have you not encountered them?" Eula asks, raised eyebrows. "The ones who look the more like us are the more dangerous, not less. Unpleasant as may be those who look on, they only look. The more similar ones are wont to climb out if the mirror tis large enough for it."

Which is at least one benefit to being tall enough to nearly scrape the ceiling - a mirror large enough to fully reflect Eula is a bit less common.