Head back to the stairs up in between ethan will be again attacked by mia.
Fighting mia in the attic.
You will fight mia twice in the game in the study in the guest house and in the attic.
To get the fuse run back to the kitchen and as soon as you leave the other side is a chained wardrobe.
Hit mia with the axe until she collapses again and the next step will be going to the attic of the guest house.
Use fire aid and then move towards the attic and lower the stairs by hitting the red button.
Luckily by the time you have to face her you have access to the m19 handgun.
Your fight with mia will first begin in the study of the guest house.
How to defeat mia in resident evil 7.