Yikes. And wow. Jeeee-sus. That kid is definitely in the shallow end of the gene pool. Not to excuse the pear-witted things people do, and it doesn't apply to a walker or cyclist, but I do know that when you're in a car with the windows closed, it can be very difficult to figure out where the siren noise is coming from. What's more, if the blue-lighted car really is behind you, they can come up so fast that they're on top of you while you're still going "Wha-a-a-a?" (I've been lucky, and have always managed to be out of the way while going wha-a-a-a, but I live in fear of being the ultimate doofus one of these days.) I don't know if there's some technical fix to the quality of sound a siren produces that would make it easier to grasp the direction it's coming from. If, for whatever reason, you don't happen to hear them until they're pretty close, they sound like they're coming from everywhere at once.