If Horace here looks strikingly similar to Bastard, that's cause they are in fact the same person. "The Hammer" is Horace's public facing persona as the champion of Fosse arena. He's a very strong fighter, and became fast friends after his bout with Marty as Bastard. The two even had a friendly rematch before the players had to leave the city, with Horace winning their second duel, leaving them at 1:1.