Mutt and Jeff
Clint had taken to patrolling the rooftops of New York city because as he'd once said to Fury he saw better from distance and it was as he was doing this one night that he became aware that some sort of weapons deal was going down. He assumed that at this time of the morning and with said shady looking figures that it might have something to do with the superpowered weapons that had taken a chunk out of Thor.
He was used to working alone despite having worked with the Avengers for so long so he didn't think anything of trailing the cars until they came to a stop and sure enough dodgy weapon deal was dodgy. He of course updated Natasha via his earpiece as they kept in close touch as they were both aware of how beneficial it was to have somebody in the know. They were after all very human.
Yep, those did not look like any standard weapon that Clint was aware of. "Jackpot," he muttered though as his head turned he became aware that two idiots with happy trigger fingers had locked aim on an unsuspecting woman. "Well fuck." At this point he reached into his arsenal of arrows and pulled a flash bomb arrow and loaded it into his quiver. Clint was fast and quick enough so as they pulled the triggers his arrow delivered a substantial blast of light and sound so at worst shots would be fired but miss their intended target.
Once certain he had postponed the initial danger Clint vaulted over the wall and hit the fire escape running until he was able to make it to ground at which point he focused his attention on the woman. The same woman he soon dragged down to the ground and upended a nearby table to provide cover for them both.