Kin is just going to cling tightly to her, trembling at both the fact that he was bleeding & hurting and that he just socked someone in the face out of rage.
“It hurts…hands hurt…” was all about he managed to get out before burying his face into her shoulder, just about ready to let tears fall.
Rebecca started to hum, remembering that the vibrations of it helped comfort him.

She kept humming, gently petting his quills as she held him close.
