Female Knight parried Atla's certain kill thrust attack and slashed.
It looks like two crosses engraved on top of each other, a magic sword technique.
There appears to be a combined X and + attached to Atla.
"Let me say instead. For the time being, please sleep. Be at ease, the wound inflicted is not that strong." (Female Knight)
"Such...Naofumi-sama, I'm terribly sorry..." (Atla)
Atla was blown away, not moving as if she'd lost consciousness.
It's probably fine to see this as having an additional effect.
In the first place, there was too much difference between Atla and Female Knight's foundations, level, and experience.
"That's the so-called Peerless Transformation style's spirit?" (Naofumi)
"Yes, I'll have her sleep for a bit." (Female Knight)