After seeing the ship survive Nyxia's lasers she hadn't wanted to chance it with a broad blast of energy, and indeed her strike had performed better then she expected as both Magical Girl and pirate looked at one another through the many-floor deep hole punched into the ship. Were they actual flesh and blood pirates they may have reacted with terror or scrambled to mount a response.
Miseria did not feel terror, as far as Roche knew, so she really should have seen the immediate and coordinated response coming. But they were Miso girls, and they were used to a more animal-level intelligence in their prey. Shaking aside instincts and preconceptions took more then a handful of minutes especially when most of them were flying by the seat of their pants.
That was to say Earthshaker hadn't expected an immediate outpouring of pirates scrambling through the freshly made gap, crawling and clambering over her as they attempted to drown her in black muscle. It was exactly the worst situation for her to be in, her energy spent and one arm already occupied holding onto the ship itself. Which was seeming to imply the Miseria pirates were connected enough that even if they couldn't see or talk in any meaningful way, they all were learning from their separate battles at an alarming pace.
Feeling arms wrap around her neck, however, added a degree of haste to Earthshaker that made such broad reaching thoughts a low priority. Her body was leaden and bulbous, weighed by small, clingy forms that only wanted to restrain her without even offering a single attack for her to charge herself. In time the chokehold would leave her seeing nothing but darkness, and she very much doubted she'd awaken at all at that point.
Now acting purely from desperation Earthshaker had no recourse but to let go of the ship and twist herself so the Miseria laden shield could strike the water for her. That large of a surface striking the water would give her just enough charge to radiate out a blast and loosen the pirates.
Or she'd fail and be at the mercy of both Pirates and emotion eating monsters as she passed out from asphyxiation.