"Well, Riza did say she met one that didn't seem to know who we are," Edward points out to his little brother as he pours the water. "So maybe he's young enough that he doesn't know Greed outside of the Sin, either. Who knows. I'm not keen on talking to him to find out, but it's a possibility. Might explain why he was so afraid of her, too."
He heads back for the living room, two glasses of water in hand.