User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-5428752-20140725020455/@comment-8874090-20140725215207

It's because the theme is played at only 2 occasions in Unite, when fighting Hypnoc or Emerald Congalala in the Great Forest, and Hypnoc's fight is much more memorable, so people automatically link the two.