The fight ends when someone hits 1 HP. Nobody goes unconscious or dies in brawling. Furthermore, brawlers automatically heal themselves to full for the next brawl. They are limited by the hard-coded number of brawls per day (4 for them, 5 for a PC), not their health.
____________"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Only fools and children dream of heroes.