Geza Kalman was a professional wrestler who ended up being Dan Severn's sparring partner after he contacted Severn to teach him some shoot-fighting moves to supplement his heel gimmick. This lead to him getting fights in the UFC and other Vale Tudo organizations.
His opponent, Carlos Barreto, was a very polished and feared fighter at the time. Kalman could only think up one way to deal with his technically superior foe: By repeatedly trying to throw Barreto out of the ring.
YouTube- Carlos Barreto vs Geza Kalman - UVF 6 [1997.03.03]
These days its fought in a cage, so those rough-house tactics won't work anymore obviously.
Maybe he thought it was sumo wrestling?