There's something about Aglovale's behaviour that doesn't quite fit, because it's clear that he doesn't consider Siegfried a threat to have him escorted out of his throne room. Nor does he see him entirely as a welcome guest. But here he is, rolling out the carpet for him and inviting him to dine with him.

(As regrettable as it is, Siegfried was never used to this kind of interpersonal maneuvering nor did he have any desire to be particularly good at it. It didn't suit him, a simple man who lived by his blade for the service of his country. Lancelot was a lot more adept at it than he could ever be, and suited him fine. He would have been a terrible mentor if those that succeeded him did not do a better job than him.)

So he supposes, all he can do at this point is play along. Even if he is playing Aglovale's game, the best he can do is play it in his own way. He will concede that the other man is a master statesman, excelling in the art to do whatever it is to seize his desires. Did he perhaps, to hope to capture Siegfried and make him turn on his allies? The way Aglovale talks seems to suggest to the contrary, that he'd rather let him make his own follies.

Truly, what a mysterious man.

(Aglovale really likes the sound of his own voice, doesn't he...)

"I apologise if you have any misgivings towards my behaviour and offer an apology." begins Siegfried. "I had no intention to arouse suspicion. If it suits your lordship, I will dine with you to that perhaps we may come to some understanding."

Because what could go wrong?