The lighting was not able to seep though the fighter as the highly charged, unstable energy bounced around the shields themselves, mixed in with the shields secondary power source, sealing magic. The negative energy began to expand from the heat the moment it neared the shields, while it's substance also was slowly sealed away by the shields themselves. The sealing magic literally wrapped itself around the negative energy so that it could seal the negative energy before the negative energy could corrupt through it.
The remnants of Japae were all the soldiers were after. It was not important for anything to remain now. It was more of a symbolic thing. The new pocket dimension, containing very little of war had once been Japae, now disappeared entirely. Pocket dimensions did not typically take up space in the parent dimension. They did, but they created another layer of space, so to speak. There was nothing around Cruor that anyone could interact with on this level.
Inside the pocket dimension, the mages were pretty much levitating in the sky, fighting off the negative energy that remained by using spell circles. Before the negative energy would have a chance to corrupt those circles, they would expel the negative energy from the pocket dimension. The corrupted fire was fought by sages who simply gave the fire nothing to corrupt, trapping them inside small holes in the pocket dimension and forcing them outward.
Kurais negative energy was also continuously expelled. The mages could keep this up all day. They began to create another pocket dimension within the pocket dimension. This one would, in fact, absorb all the negativity, the negis included, and break the negativity down, pitting it against itself.
Kurai would not have even been able to get near Disney before her tendrils were incinerated and sealed away by the shield surrounding it. Railgun fire began to rain down on Kurai, the ballistics too much for one negi alone to handle, especially when she was being absorbed into a pocket pocket dimension.