Sadoko's really struggling for a reason to appear if Mako's yuribaiting is being spent on Erika, isn't she?
Oh, and who says that impromptu tank duels in other people's schools are against the rules?! They wouldn't let children drive tanks instead of cars if they weren't safe!
DISCIPLIIIIIIIIIIIIIIIIIIIINE!!※ The shells have been switched to practice shells for public safety