[TF2] Just What Even Is A Subclass?

I apologize in advance for the terrible Trolldier clips, anyway here's Fart of the Subclass.
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Music used:
Super Smash Bros OST
Oahu Beach Stroll - • Oahu Beach Stroll - n...
Video clips used:
Demo Mesa: • Demo Mesa
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Swimmy elephants proooont: • GoPro: Swimming Elepha...
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Slime molds: • True Facts: The Smarte...