Sergio Colas has taken part in Pamplona's running of the bulls at the San Fermin festival for a decade and escaped serious injury every time. Last year, he was touched in the back by a bull's horns. That was his closest call. The 30-year-old deaf man who works in a local Volkswagen plant says he feels vibrations from the firecracker that tells runners the six bulls and six steers have been released from a corral into the cobbled streets of the northern Spanish town.