Maximus: I knew a man once who said, "Death smiles at us all. All a man can do is smile back."
Commodus: I wonder, did your friend smile at his own death?
Maximus: You must know. He was your father.
Commodus: You loved my father, I know. But so did I. That makes us brothers, doesn't it? Smile for me now, brother.
After challenging maximus in the arena, Commodus walks up to Maximus and stabs him in his back. Then orders Quintas to strap on Maximus' armor to conceal the wound.