The final chapter in this year’s running of the bulls in Spain left four people injured with fractured bones and a head blow Tuesday, but no one was gored. One of the six bulls set free in the last of eight runs through Pamplona’s cobblestone streets covered the 850-meter (half-mile) route in an extremely fast time — one minute, 49 seconds — and at one point barreled into one runner and flipped him into the air.