Stilton: You know your wildlife.
Although a light shower only dampens them and makes them run in a comically soggy manner, it also renders scissors ineffective until a sunny spell. We tend to hunt them during the summer months after a winter at the grind stone to ensure our scissors are swift, silent and sharp. And of course they don't like matches, which is why only suicidal cardboard beasts smoke and are shunned by most herds.
It's a tradeoff. They're harder to slice up, but they also can't really inflict nasty cardboard cut wounds when soggy.
Think I need to borrow one of your tribe's pairs. The last set of scissors I had broke while trying to cut a cigarette filter in half. Didn't even know that was possible.
That does make sense. Didn't list fire as a weakness, though, since I figure it's pretty much a weakness for everything.