Knut takes on Marius because he allegedly hit on his girlfriend.
They immediately head to the mattress in the bedroom, where a tough fight between the athletic, lean guys begins.

Knut, who usually appears rather reserved, goes at it with full energy.
Marius becomes increasingly angry due to the fierce attacks.
Whenever Knut is underneath him, Marius punishes him with leg scissors, wedgies, and powerful holds, even using objects lying around to gag and hit him.
But Knut is not impressed by this at all.
On the contrary, he keeps coming back and attacking again and again.
In the end, he even forces Marius to submit - something nobody expected.

Delighted with his victory, he then takes a shower, where we are allowed to join him until the end.