This sub-boss doesn't have much in variety for attacks, but he will attack quickly, and will attack even quicker as his health drops. The trick to defeating this sub boss is to either get him to target you and dodge his attacks constantly to allow your team to attack, or to armatize with Edna and pummel him, dodge, pummel. He can be prevented from attacking if you keep your combos going. This is important to do as he gets faster the lower his health goes so make sure your BG is timed right to keep hitting him with combos. If he's staggered, attempt to use your Full BG attack. Eventually you'll kill him. The main worry is his quick slash which can do a lot of damage in a short amount of time.