[quote=@Hekazu]
[@Dusksong]
It is pretty much like Lord of Evil guessed, a very small window akin to an arrow slit. Not quite as small, but even if the glass on it were to be broken one could not squeeze out of the hole. With what tools you have, enlarging the gap would be impossible.
[/quote]

Oh, they have windows in this setting? Although it doesn't make much sense in a fortress... Welp, you're the boss, I won't question it. Although now that I think about it, maybe this isn't a fortress. Hm...