He has an initial thought about his parentage, then adjusts once Magnus' actually meaning dawns on him.

After a moment he says, "I am sorry, but I can change neither my past nor my training." He thinks, briefly, that there is little he can do about his demeanor, as well, but he isn't sure he agrees with that any longer. "I strive for peace and accord. I want us to get along. But I do not need you to like me, if you do not already. I will treat you with as much respect as any here-- and not just for Galahad's sake."