that's incredibly messed up. the only thing my school did remotely close to that was try to give me detention for not showing up to 3rd period. oddly enough they didn't give a stuff I wasn't there during 4th either. they never even brought it up, they just really wanted me to admit i skipped 3rd period for some reason
which i mean I did, but because I was at a college taking coding classes that my school requested me to attend. not really sure wtf they would have accomplished there but whatever.
if you didn't plagerize, then id laugh in the face of anyone else that says otherwise because there's literally nothing they can do. however this teacher totally seems like the kind of bastard who would find some random piece of literature that's not even close to your paper but maybe like, one sentence is kind of similar so to him that's proof. i really hope that doesn't happen. and i really hope if it does your principal is just as dumbfounded as we are