harry potter and the ghosts act 2
harry ran to the classroom and hermoine was there
"fuck you harry you and ron make it harder for me to be perfect in class so im gonna kill you" said hermoine
she grabbed a wand and used perfect magic that hit harry in the face and he fell
"wait a minute" said harry "your not actually hermoine your snake so you cant know the same magic you just know defense magic or stuff idk im just looking at the wiki here"
"AHHHHH" shouted snake realizing the magic only put a shield around him but then he realized it was a perfect shield so he couldnt get around and attack him so snake threw some books at him so harry picked put a desk and bent it a little and threw it so it spun around the shield and hit snake in the back of the head and he fell and harry used magic to get the ghost out and it disappeared
"ok now lets go find ron"