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.