[Eryops]

Originally Posted by Dante of the Inferno

Btw, anyone know why Rika's knuckles are bloody?

Spoiler:

Because she just punched Satoko (who is currently lying under that chair) in the face with all her strength. That image is somewhat inaccurate though as I think that Rika should look more composed. She was very pissed off in that scene, but she nonetheless maintained some self control, e.g. by taking care not to hit Satoko too hard with the chair before planting it on top of her.