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There are people who line up at the arena gate and pretend to have run with the bulls. They enter first, and as they do the crowd jeers by calling them “Hijo de puta!” over and over.
After the bulls have run through the arena, steers with blunted horns are released so the participants can display more bravado.
When the ox that led the running of the bulls is released, it signals that the festivities in the arena are finished.