User blog comment:IamJakuhoRaikoben/Chapter 480: The Northern Gravestone, Review./@comment-4829046-20160404160715/@comment-7418318-20160404172904

I only remember reading about a plank being passed and Laki saying her wood-make would be faster.

That could just be them boarding up the hole, so they don't leave an easy way into the guild.

If you expect an attack it's only natural to fix the "fortifications" as good as you can. Even a simple barricade is better than leaving a hole.

Of course with mages the rules are quite different, but I can understand why they'd want to at least patch the hole for psychological reasons if nothing else.