I think you may have summoned the wrong Servant, but who am I to judge?

"I might remind you, maître-moi, that I am Assassin, and not Saber or Lancer. My strengths," the irony, "are in surveillance, espionage, and as a clever boy like you might surmise, assassination. If you want me to brawl with some knightly hero, I'll need more mana to fuel my fantasme-magnanime." She looks at him with mock-petulant eyes. "I know I must be so very difficult, but I'm an expensive woman, don't you know?"

She could draw a card right now and drain him dry, to make a point, but there was no need to dissolve what rapport existed between just yet.