When Bartholomhew is close to death and splits as a survival technique, Holomhew is the positive charge and Bart is the negative charge. They can't conduct static if they aren't near eachother, but the closer they get the more conductive they get.
In order for them to form back into Bartholomhew, not only do they need to be together, but they have to fight eachother so it will charge them up enough to fuse.
Interestingly, if Zak (the positive charge of Zakary) charges with Bart, they will form a new hybrid super-conductor. However, their "politics" would get in the way.
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