In case people take what the first person in the video says combined with your quote from wikipedia but don't read the entire wikipedia page I'll quote this:

In case people take what the first person in the video says combined with your quote from wikipedia but don't read the entire wikipedia page I'll quote this: The left half of Bugorski's face swelled up beyond recognition, and over the next several days started peeling off, showing the path that the proton beam (moving near the speed of light) had burned through parts of his face, his bone, and the brain tissue underneath.