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After watching the latest trailer, there are three main points I feel needs to be addressed:

  • How is the crossguard constructed? Is it similar to a double-bladed saber's construction of using multiple crystals to achieve the emittance of multiple blades?
  • Why does Kylo Ren's saber flicker? Seeing as the blue saber Finn was wielding in the trailer is similar to a good old Jedi lightsaber, we can conclude this isn't a new CGI style, and thus likely have an in-universe explanation. Are there functional differences to it - for example different combat characteristics, or perhaps it is unable to achieve zero energy leak?
  • Overall, is it a technological advancement, a "primitive homemade device" or simply a variant on a roughly similar level of technology?

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