From Bullshido.
Check out the big guy (white pants). He's got good defensive foot work and timing. Too hard to tell what style, could easily be karate or kungfu. He tries to land a quick backfist and roundhouse punch (misses), clinches, tries a karate/judo type takedown (not low enough) lands a pretty good karate style knee kick in the clinch and then a pretty hard overhand.
http://www.bullshido.net/modules.php...op=getit&lid=7