More apt explanations (since I had this exact school experience)
Stampede, hamster wheel, robot, and zombie are all going from one period to another.
Obviously first period is filling your brain with sterile contextless facts with no value on their own.
Second period is gym. I dunno about you guys but we got worked hard in gym.
Third period is a test, quiz, or presenetation of some kind.
Fourth period he gets sent to the principle's office so they can make him fit in.
And then when the bell rings he finally escapes back to where he belongs (not there)