HIM decides to destroy the RRB and and try to re-create again with his own versions of them.
They tried to escape, Boomer and Butch didn't make it and only Brick survived.
Anger rises and decides to take revenge on HIM for killing his only family.
Of course, Brick cant do it alone, so he decides to beg for help with AKU. (one of HIM's arch enemy)
AKU made an offer that Brick will forever serve for AKU. As an apprentice and a son.
If Brick agrees, AKU will save Boomer & Butch lives and sent them to another place were they're safe.
but Brick is banned to have contact with his brothers nor friends or any other people he knew.
and that's why Brick works for AKU.
Hmm, any suggestion?
Brick, Aku(mentioned) & HIM(mentioned) (c) CMCc
Art (c) Me