It was something he knew of well. Using the souls of many as a battery in order to prolong a cycle of millions being sacrificed while one was "saved" from the very force that continued the cycle. He almost kicked himself once for agreeing to blindly be a battery for such a stupid thing. Saw fragments of potential other timelines before losing grip and returning to the wastes of his own world.

There was no way he would sit back now when someone would rather reset a similar madness. Not while Sora's soul still acted as his conscience despite its absence.

Lowering the visor of his helm was all he could do in order to hide his scowl. Perhaps if he lived through this, he'd punch Reno in the face for that remark on soul energy. Until then, he unsheathed Soul Eater and stood at the ready, preparing a Break spell. At least darkness was a familiar comfort in comparison.