Two nice videos of Mike Faraone, the former European rep. of Vunak.
http://www.youtube.com/watch?v=L9GzwClhTZk
http://www.youtube.com/watch?v=EFEPiEeSVeI
I am not familiar with Silat, Serak, but I think the techniques showed here are quite good.
If you have any comments please post them, I'd like to know what others think about it. Thanks