Well, as I have said in many other instances where people are telling stories about encounters with cops, there are roughly 800,000 of them in this country, and I can't begin to explain the behavior of each one. Maybe he had instructions to aggressively question (interrogate, if you will) anyone that behaved in what he felt to be a suspicious manner, and maybe he was just an overbearing zealot. I freely admit that not all cops handle situations in the best way that they can be handled. I think I've been guilty of that a few times, myself.