The voice may be unknown to her, but the accent is not. She's met Legolas and his voice carried much the same variants, so, while Arwen is loath to relinquish the weapon, she does lower it and turn around. Doing anything less than properly greeting another Eldar would give her mother fits.

Even if said mother has sailed beyond the Sea.

"My lord," She bows gracefully in lieu of a curtsey, and offers a polite, but genuinely warm smile. "That is most generous of y--"

Her voice, soft and musical, trails off as she catches sight of his wound. Now the lady does set down her weapon, stepping forward with her palms up, and gestures to the shoddily-tied bandage.

"If I may, lord, your bindings need to be tightened."