They say Bang Shishigami is not a descendant of Chuck Norris, but an Ancestor, proving not only is he stronger than Chuck, but Chuck learned from Bang as well.
There are no faults to Bang Shishigami. His Fu-Rin-Ka-Zan is more powerful than a roundhouse kick to the face from Chuck Norris, or a Falcon Punch from the one and only Captain Falcon.
*Weak kid follows the teachings of Bang Shishigami when he gets home*
*The next day, the Bully is nowhere to be found after a run in with the weak kid. He is no longer weak.*