The smallest movement could be picked up by his ear, the cut of fabric through the gusts that sailed over the bridge could be felt against his body, and the very heat that this man radiated (heat wasn't right, it was similar but something else entirely, like a radiation or something)pulsated through the air. When the Daredevil wanted to he could be on highest alert for all changes.
But that also meant he was highly aware of the cars below. The larger trucks that gave off plumes of smoke would rise and in intervals throw off his sense of heat and smell. And any honk of a horn gave his ears a painful buzz but they were up high so it wasn't nearly as bad as fighting on the street beside such things. Still, all things had to be considered when he was using his powers like this against someone who clearly knew what they were doing.
He hardly had time to drink in the information given to him but he did stow away the names. Danny Rand-Kai. The Iron Fist. Right and was that "iron fist" coming at him right now? Cutting through the air like a machine? No, he could not see it and most wouldn't be able to anyway but he was able to maneuver backward three steps and then back flip out of the way, ducked down and swept his foot out to trip him up so he could have the higher ground.