Derek's mouth was wide open, he couldn't believe that Devon could still be on his feet after that attack. Those three techniques were some of the best self-created techniques he had.
The same lesson the dominator taught Devon was the same one he taught Derek. The best way to improve one's battle skill was to create a battle style and technique suitable for his or herself and continue developing it further.
Using other techniques was the same as following in their footstep. So, why not defy the odds and define one's own destiny.
As easy as it might sound, creating techniques was extremely hard. In the whole underground world, powerhouses who were capable of such perception are not up to twenty.
If words get out that a youngster was able to create several high techniques. Different families and organizations would come looking for that youth. It was even highly possible that the three big would make a move.
