Y'know, they talk multiple times about needing more weapons than just the axe, and yet they never bother making more weapons. They had all that time the second office, the one with the fitness center and the SUV, that they could've made another weapon. And then at the campus, they have all this time to make more weapons. And they just...don't. And not for lack of materials. After all, they have an axe. There was a conference table, as well as some couches and benches, in the second office. The campus has plenty of beds that aren't being used. Take the axe to a couple, chop the bed frames side pieces off (the long sides), and fashion spears out of them. Not only does that give the girls a way to defend themselves, but it's also a lot more of a ranged weapon than the fire axe is, lessening the attack power of the Burned Ones.