Balmunk's magic is ridiculously OP. He can do pretty much whatever he wants with no explanation of how it works. It's simply "magic". He created this huge monster like creature with his severed arm.
Gamma goes into his Shinigami beast like mode, but then he stops himself after thinking of his girlfriend. He remembers that he doesn't want to be that person anymore despite how badass he gets in that mode.
He uses his black flames to attack the monster creature and then ends up behind Balmunk and unleashes an attack on him from close range. Is that going to be enough tho?