>>281185705
Devils are a weird lot. Based on previous Devil behavior, I'm pretty sure Yoru thinks she's a really good friend to Asa. It sounds unbelievable but that's how a Devil's mind has been depicted to work.
From Yoru's perspective, not killing Asa over a crossed word shows that she has the patience of a saint. She probably thinks Asa is really ungrateful for lashing out at her, as she's done nothing wrong apart from blasting away some human scum, which is what Devil's are supposed to do anyway.