"All right. It sounds like this was a misunderstanding." Cirelyn tries to keep her voice quiet and soothing, although part of her still wants to berate Karan. But if the Blademaster finds out about this she imagines he'll be getting more than a lecture; roughing up a servant for doing his job seems like the kind of behavior the Tower discourages forcefully in its trainees. She smiles - hopefully reassuringly - at the servant boy, and repeats, "What's your name?"
She glances quickly at the ground to see if there's a bundle of discarded practice swords there, and then looks back up to study the youth's face for a moment, looking for the subtle signs of nerves and dishonesty. Admittedly, right now that's complicated by his very obvious fear at the accusation and Karan's presence.
Spoiler
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Sense Motive on the servant, to attempt to see if he's being honest.
(1d20+8)[10].