Head back to the stairs up in between ethan will be again attacked by mia.
Fighting mia 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.
To reach the attic you ll need to activate a fuse box in the living room.
Hit mia with the axe until she collapses again and the next step will be going to the attic of the guest house.
How to defeat mia in resident evil 7.
Upon arriving there collect the handgun from the table and walk around the attic.
Luckily by the time you have to face her you have access to the m19 handgun.
Use fire aid and then move towards the attic and lower the stairs by hitting the red button.