Behind him, far behind him very soon, he heard the sounds of pursuit being balked by seemingly inadvertent things. He could guess what those things might be: a milk-cart with a loose wheel, a quickly gathered crowd watching two men brawl in the street, a keg of wine spilled as it was wheeled into a tavern. He knew Tregea, which meant knowing the spirit of its people too.
Baerd knows Tregea. You can feel the implied smirk as he hears the noises but doesn't turn, and continues his flight across the rooftops.