The founder, Ba Pak Sera, had a clubfoot and only one arm. His style, for obvious reasons, had to rely on something more than pure physical prowess. In Serak and Bukti Negara power is generated through proper skeletal alignment and efficient body mechanics. At the higher levels it is developed through breathing. Timing is paramount.
Speed is garbage.
Timing is everything. The eyes are used to keep track of those who are out of arms' reach. Once contact has been made sensitivity is used to monitor the opponent. Sensitivity is developed not only in the hands, forearms, and lower legs but the entire body. This allows the student to fight multiple opponents without confusion.