She allows his consideration to settle, he'll ask for help if he needs it, Mab is confident she projects capability to others. "Lancelot." She repeats his name, letting the sound of it roll off her tongue in perfect mimic of his own pronunciation. Someone raised with the Seelie will know not to give her name out even if only on an instinctual level. And he seems like the type to appreciate honesty.

"I am Mab. Lady of Air and Darkness." She does not correct his decision that her intervention was kindness. In a way it was. And he is being so polite it seems a shame to do anything to ruin it.