He went back in like a man with something to prove, because he was.
Moses had left her softened but standing, and Trafalgar meant to make that gift count. No more living in the gaps to survive. He came off the broken stone with the well inside him filled past the brim, and this time he didn't fight to stay breathing. He fought to take her apart.
The first strike set the tone. He crossed the distance and drove an inverted crescent of black light into the tendon-cut Moses had opened on her hind leg [Morgain's Final Crescent], and the whole limb buckled, and she crashed down onto that side with a shriek that rang the pillars. He didn't wait on her to recover. He was already moving.
And here the cavern gave him what it had been giving him all day, only more of it.
