I love how they used the same vocal line as Receive You the Subtype, but with it now being constant in the song and being more harmonised with the song.
I hear a bit of it too, it must be because this is supposed to be a fusion of a theme for both Majima and Saejima. It’s supposed to fit their duo since you fight them both while this plays, so I can see why they’d put a bit of Hailstorm in the fight just for Saejima.