When Killua faces off against Zushi , he has no difficulty at all , until Zushi uses a strange technique reminiscent of what Illumi used .
There , they meet Zushi , another young teen with amazing strength .
When Killua faces off against Zushi , teen has no difficulty at all , until Zushi uses a strange technique reminiscent of what Illumi used .
There , they meet Zushi , another young teen with amazing strength .