Jon walked towards the road, and that was when someone whistled to him. Well, he assumed it was to him, because there didn't seem to be anyone else around. He turned and looked over his shoulder. Down at the other end of the alley, he saw a woman dressed in black. He squinted his eyes, thinking that there was something familiar about her, but he couldn't quite remember.
She just stood there, as he walked towards her slowly. By the time he made it halfway down the alley, he was sure that she was the one that whistled to him. Why else would she still be standing there, looking directly at him?
And when he finally met up with her, he asked "What do you want?"