Indeed, even though I strongly dislike this type of music, I really, really have to admit that he is an amazing dancer and was trained really, really well.
In fact, it is quite hard to describe without metaphors. Using metaphors, you can usually say that the music just feels as if someone smashes a heavy hammer against your soul and once the music stops, it pretty much feels like you fall down, as if you were leaning against a wall and someone removed this wall. Music which gives me this hammer -> face-feeling certainly includes, but is not limited to songs by Cryptopsy, Vomitory, Berzerker and to some extent Heaven shall burn and Suicide Silence (examples can be easily found on youtube). If you listen to several songs by these bands, I think my term 'light pop'will certainly become clearer :)
Here is the moonwalk, probably his most famous move (he wasn't the first to perform it, though): http://www.youtube.com/watch?v=KnIDfDFqGWc
Here is the anti-gravity lean relevant to this patent: http://www.youtube.com/watch?v=8HJbGSHtFYQ
Here is a montage of many of his dance moves: http://www.youtube.com/watch?v=xKBLxh3u0tM