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In addition to Hillmann, 32, a 35-year-old man from Valencia was also badly gored by one of the bulls, according to the festival's website.
Hillmann, who co-authored the book with John Hemingway, Joe Distler and Alexander Fiske-Harrison, is an practiced runner with 10 years of experience under his belt, sanfermin.com reported.
Fiske-Harrison wrote on his blog that "Buffalo" Bill Hillmann was doing well after surgery.