I think he was shaking inside. The crowd had expectations, and Ringo is experienced enough to know that one poorly timed dump or one sticky vacuum could ruin his chances. But like a hero, he easily volunteered to fill other people's time slots, without a break between bouts, when others weren't ready. My personal thanks to Hockey Judge Paul Martin, for keeping good order, and keeping the game moving even when the spectators crowded the ring, or when robots suffered battle damage. They didn't come to play, they came to win.
Robot sumo inspires as much emotion as the real thing.
For this crowd, this IS the real thing. Autonomous machines are slower, and must find their opponents through infra-red or ultrasound. Tethered machines are more powerful, and use the brains of their operators. But both contests, run side by side, are exciting. Sumo Judge Adrian Neal had to calm some folks down after controversial, but correct, calls.