Boss battle track's B part was supposed to be more "cool" as in uplifting moment of getting an upper hand (a power up of sorts, super sayian, dunno), while A part being more "heavy", to be more reminiscent of Shackles (more of an Enemy theme). But yea, it is quite a gap to bridge, I would need for that three more tracks or so (which was my intention before I realized how unrealistic it was xD )
Thanks for feedback!