There are a lot of people out there with special hearing, it could be anything, really.

Matt filters through the rain hitting the roof, listens to the van drive away and, if he really focuses, he can hear Clint's footsteps splash against the pavement. Clint can take care of himself, sure, but Hell's Kitchen can be dicey - even on a night like this. He moves across the rooftops for a while (Daredevil doesn't really walk on the sidewalk) until he finally joins Clint street-side.

"Not a great night for a stroll."