— of course it is happening inside your head, harry, but why on earth should that mean it isn’t real?
You can change the frame speed in the animation toolbar! Here’s a tutorial on how to do that, and I usually set mine to 0.6 frames!
"You will find that I will only truly have left this school when none here are loyal to me."
Slytherin sealed the Chamber of Secrets so that none would be able to open it until his own true heir arrived at the school. The heir alone would be able to unseal the Chamber of Secrets, unleash the horror within, and use it to purge the school of all those who were unworthy to study magic.