there is an emptiness inside me now. You made it.” I plunged my robot arm into his chest and closed my fist around his heart. The thick gristle of vein and artery fought against me and I almost gagged. “Please . . .” His voice was little more than a strangled breath through clenched teeth. “Please . . . mercy . . .” But I slowly ripped out his heart.
Boy must rip the evil out of the world (literally) in order to feel again. It isn't revenge, but a search for someway to simply rid the world of his evil.

