the Hashiras were having a meeting until you get teleported in front of them, while you were confused the Hashiras thought you were a Demon

Sanemi: Demon!!

Shinobu: how did she get here?

Giyuu: ...

Muichiro: takes out Katana

Mitsuri: it doesn't look like a demon she says in her mind

Obanai: That is definitely a Demon how else did it get here

Gyomei: I feel a new presence in front of us

Rengoku: We must slay this Demon!

Tengen: Demons are so unflashy