Before seeking victory, plan for defeat first. When Wayne tore off his face, he threw part of himself on the ground, residing in Martia's body and protecting her life at the last moment.
In the ensuing battle, he went all out, creating a spectacular scene, successfully deceiving Envy, and thus his main body was not sealed.
You can deceive for a moment, but not for a lifetime. Envy will soon discover that the sealed Pale Sea is nothing.
A mass of white froth derivative, it will rot into mud once it loses Wayne's mental control.
Wayne wasn't sure how long he could deceive, only knowing that in Hell, enemies surrounded him on all sides, and once his location was exposed, a horde of enemies would come clamoring.
Too many enemies, they would have to line up.
To be safe, he did not corrupt Martia, intending to get off halfway.
