If anyone is still wondering, this combo is still very much viable on Musa. Though Musa is quite freeform, this combo is STILL reliable at gyfin (and I can even use it at jade too!) At Gyfin, and at the proper AP, some of the mobs might die at Crust Crusher with Low Blow flow, and others will die just after Crust Crusher with Low Blow flow by just using another crosscut. When you get to a certain point, you will not even need to use Storm Slash (Hotkey Lvl 58 Rabam) and Mountain Divide. The only time you MIGHT have to use Storm Slash and Mountain Divide is against Red and even then, it would be just barely. As long as you are running the right buffs and such, and have the right amount of AP, this place is great with this combo! As a side note, this combo literally runs over the Butcher. When Butcher spawns, get behind them, run through the entire combo, and they should be dead. Make sure your crystals, and your lightstones fit your wants, along with your skill add-ons!

Well done Godneseye! As a musa main since 2016 myself, it is great to see people still running combos like this!

As an aside, you're aware Mountain Divider quickcasts out of One Step Back with LMB, and Storm Slash can be quickcast right after with LMB too. Haven't seen someone make a frame by frame comparison but it feels just as fast either way.