Camcorder intimidation

I've encountered this response a couple of times. I'm always intrigued by people taking pictures of other people. If I see it happening, I'll get out my camera and start snapping away. Often the response is for the individual (or even individuals) to start taking pictures of me. I suspect it is, consciously or unconsciously, an attempt at intimidation (I've got a bigger...). Having seen it before, I'm not impressed and carrying on snapping anyway. He's not well placed. There's a limit to how long you can stand in the middle of the cross-walk, even with a camera as big as that one.