Because you aren't insane. [ He says it thoughtfully, as if a little surprised by his own verdict. A slight smile, then. ] Because I've learned that there may be an outside power tossing dangerous foreign knights into this plane - which ought to be impossible. If so, my standing orders are to investigate - and stop the maniac responsible.

[ The smile disappears, something beneath his matter-of-fact tone intensifying sharply. ] Because I need to know what you are and how you came into my Empire, Sir Bennet du Paris. And not least because if I do not help you, you may very well end up capturing some other poor fool to do it. Someone less capable of protecting themselves than I.

[ An admission there, that if they come to blows it's very likely he won't survive it. Possibly it tips his hand regarding his other concerns, but the fact that investigating dangerous magical phenomena is his actual duty ought to be explanation enough. ]