excuse me? excuse me

A young man (late teens or early twenties) was walking a bicycle, on the other side of the street, against traffic. I was walking toward him and then veered left to go up a sharp hill, to get some cardio exercise (second day in a row!). As I walked uphill, my back turned toward him and the street we were on, I heard, "Excuse me? Excuse me!" And then a third time, louder and with impatience and anger thrown in, "Excuse me!" For good measure, he threw in a whistle, as you would toward a dog. It was all meant for me. No one else was around. I continued my march up the incline, never breaking stride or looking back. (In my experience, a person who greets you with this sort of "excuse me" is bent on a) panhandling b) hustling) c) robbing or d) all of the preceding.) After reaching the top, I surveyed the surrounding village, the lake beyond, and the mall on its shores. No sign of Excuse Me Hustler Bicycle Dude.