[@letter bee]
Mergoux watches the sales with disgust and a look of rage on her face. She's crouched on a roof on the edge of the marketplace, a position she's often held, waiting for this day. She'd spent the last few months scouting the area, making sure of her position and making sure she could escape. Her heavy crossbow, a large wood and steel weapon of war, lies are her side, arrow lying on the string, ready to be cocked and fired

She watches the Edelweiss family sold and shakes her head in pity.
"Poor bastards, they'll be first then." she mutters to herself
She cocks her crossbow and watches further, as more people are paraded and sold. Her rage and sorrow only grows as she remembers that happening to her, many years ago. After over half the slaves have been sold she's had enough.
"This stops. Now." she growls
She snatches up her crossbow and braces it against the roof's edge then looks for a target. 
She's made sure to dull her armor so that the sun doesn't shine against it, giving away her position.
She narrows her eyes, aiming down the length of the crossbow at her target, then pulls the trigger, sending a bolt flying at the fat Auction master. Once the bolt is away she quickly nocks another one and cocks the crossbow again.