it was night time, the hashiras were going to a village they started walking towards the village, eventually they saw the demon and hid behind a tree, so she doesn’t see them

Sanemi: why are we hiding?

Shinobu: she can’t see us when we attack.

Obanai: she looks weak to be honest.

Giyuu: not saying anything

Muichiro: looking at the sky

Mitsuri: kya! but she’s so cute!

the demon saw and walked towards the hashiras

Sanemi: oh shit- he hides behind obanai