Miss Lemongrass mentioned a "bone"... though I didn't see it to tell if it was large enough to be used as a weapon. Still, the victim herself wasn't missing any, I assume?

[He reminds Edna, but he'll listen to Taiki. Observe him, too. Is this first brush with death? He seems to be struggling through it, but at least he's determined and useful. B looks calm (at least, as calm as you can look when you're crawling around on the floor) in comparison.]

If there was no blood at the original scene, then I'd say it's a 93% chance the actual murder was here. It appears the floor was cleaned somewhat... but no drag marks to speak of.