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This is even worse with his Gundam, the Bolt Gundam. He wears a pair of gigantic beam manacles - the bracelets are metal, as are the first links attached to them, but if he pulls them too far apart, a blue beam chain snaps between them.
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In this case, though, you do get an answer: The plasma used in beam weapons can also be guided and shaped by specially-aligned magnetic fields, essentially forming a surface tension around the 'blade'. An especially egregious example is Deathscythe's energy scythe in Mobile Suit Gundam Wing, which knows both how to come to a point and to curve.
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