Not to mention extremely rude... and arrogant... Rhakzan would rather assassinate the Oracle than deal with her, but he knows his siblings still have questions for her, and might want to deal with her.
His face, though betrays none of his thoughts [bluff +46]. Instead, he says "Wait, wait, why the rush? I thought assassinating king and agreeing to peripheral damage to the populace would be rather high on your list of things that 'require attention'. Really, this impatience is quite unbecoming of an Oracle, don't you think? How do you expect to hire assassins and overthrow your government if all you have for your potential hires are threats and insults? I'm sure your used to dealing with fawning supplicants, as I can tell by your manner. If you think about it for a moment though you'll see the questions we're asking are extremely reasonable. It's clearly not the questions you object to, but us. Yet if you want to perform assassinations and take down an ally of the empire, you'll have to deal with us or others like us. It's been clear from the start that even if we agree to work with you, you'll never be inviting us home to meet the family. But still, if you want to work with us, the least you can do is treat us less as 'leeches' and more as business associates, and answer our questions, no?" [diplomacy +52]