Dead man walking tornado. Multi Vortex Tornado. Why is it so dangerous?

When we think of tornadoes, images of swirling wind funnels tearing through landscapes often come to mind. However, among these destructive forces of nature, a particular type is especially feared: the Dead Man Walking Tornado. The name itself evokes a sense of dread, and rightfully so. But what exactly is this phenomenon, and why does it stand out among other tornadoes?