So, do you think that i...is this normal?

LoL, dude, why'd you even submit that IN SCHOOL? Of course it'd be normal for the teachers to think that way. The best thing you could do now I guess is tell them what you typed in here and act like it's no big deal because really, it isn't a big deal. Once they realize you just wanted a major twist and kill off the characters, they'd lay off you.