If the alarm can be used to a specific enemy since it was said that he can manipulate it to any sound or frequency, imagine timing a sharp hertz or a fork being scratch on a plate it can cause disorientation and if used at a perfect timing it can throw off the opponents accuracy

Its a strategy of weakening the strong to be finish by the strong force since they will be tired

If krampus finds out she got decimated before they can regroup krampus would retreat. She also considered that with her power weaken she will be betrayed and all of her hard work will be taken by krampus as she said she cant be the only one screwed over

It seems many story from the author connects to this story

I can finally message