When those gunshots ran, Ren felt ready to attack and he was about to when it seems the other changed his mind and let the shadow go.

It does manage to calm him down, but he's still mad and keeps a glare at him.

"I get you were hungry. I know too well what happens when I don't keep my own hunger in control. But you didn't need to be an ass about it."

He keeps a close eye on him, just in case he will need to actually fight.