I happened to come across a cockfight recently.
I wouldn't normally go to a cockfight because, I don't like to see cruelty, and I don't want to be accused of being involved in anything illegal. But since I happened to come across it, I took a few photos. The people did not want their photos taken, but were OK if I photographed the roosters.
They tape spurs onto the back of their feet.
The actual cockfight lasted only about 20 seconds.
The losing rooster, coughing up a lot of blood. It probably died. It seems the spurs puncture the lungs.
The winning rooster, also coughing up some blood, but able to stand up.