[The possibility being raised doesn't seem to trouble him much, although he does think that C has a funny idea of how not to waste time.]

You profess to know so much about Cesare and I from your history. One would think an enmity between such distinguished figures would have been noted, if it had existed.

[And if not... does he honestly expect him to tell him the truth, if it had really been him? It's a fruitless line of questioning, so pardon him if he sounds a bit sarcastic.]