What film  is directed by screenwriter Sacha Gervasi, in his directorial debut, Feiyu Show or Anvil! The Story of Anvil?
Feiyu Show: Feiyu Show () is a 2014 Chinese documentary film directed by Sun Hong. Anvil! The Story of Anvil:  The film is directed by screenwriter Sacha Gervasi, in his directorial debut, and features interviews with other musicians who have been influenced by the band, including Slash, Tom Araya, Lemmy, Scott Ian, and Lars Ulrich.
Anvil! The Story of Anvil