The dwarf's raised voice gives Rowan time to prepare for a possible confrontation, so the sound of the dwarf's hand on the strange creature's table only makes her glance up in curiosity, rather than jump or flinch in surprise.  At the tortle's lengthy explanation, she only rolls her eyes, mentally preparing to step in to prevent what could turn into a tavern brawl.  Granted, the tortle was unintentionally most likely aggravating the dwarf with his long-winded explanation, but that still was no excuse for destruction of property.  She's content to simply observe how the situation goes for the moment, though her emerald gaze takes on a slightly more golden appearance as she watches the two out of the corner of one eye.  the rest of her gaze is solidly focused on the food in front of her, not wanting to add fuel to the dwarf's anger by his assuming she's eavesdropping, though his volume makes actual eavesdropping unnecessary.  Yet discretion is still a wise choice, and she would rather avoid provoking an already angry dwarf, if she doesn't have to.