They use each other and are suspicious of each other. He was instigated and ultimately defeated by a pile of scrap metal. Reluctance and regret welled up in my heart. But it was no use, because everything hit rock bottom. Who is really willing to be a slave to some scrap metal? "We've been used by you since we were born, haven't we? Now it's just the other way around, isn't it?" "When everything ends, it will end with mutual use again..."
Intention: It doesn't have to be who leads whom.