One bull chosen to take part in Saturday's San Fermin festival ran back to the safety of his corral. Meanwhile his five stablemates didn't disappoint thousands of people waiting to be chased through Pamplona's narrow streets. The bulls gored four revelers — including one 20-year-old American identified only by his initials A.G.O. — and injured five others with cuts and bruises as they hurtled through the northern Spanish city.One bull charged into runners, goring one deeply in a thigh while cutting another runner's leg as it lifted its head. Red Cross spokesman Jose Aldaba said four people received treatment after being gored while at least five others were recovering from bruises.