Quote1 Without Scarlet interfering, the tenements go up in smoke for sure this time! Quote2
-- The Fire Fiend src

Bill Wilcox was a greedy landlord and arsonist, who adopted the gangster identity "Fire Fiend," and clashed with Mr. Scarlet. He was defeated, and was offered a second chance. He tore down and rebuilt his crumbling tenements at his own expense, in return for which Mr. Scarlet kept quiet about his crimes.

enemy of Mr. Scarlet