Even experienced Martial Artists can be injured or killed; this is a very sad story, but it illustrates a valuable lesson. Physical confrontation is not generally a good thing, and avoiding it if you can may save your life. Without more details, we don't know if the victim here could have walked away or not; I suspect it was a surprise that he could not have seen coming. But it's chilling and frightening; danger lurks everywhere. http://www.nytimes.com/2010/10/01/nyregion/01leash.html?src=mv Be careful out there.