My guess is as good as Gundam's. Something to do with E-Pacs, compression and reaction is good enough for me. As for how the Snake works, I'm assuming a phase shift in the atoms so the particles can pass through solid objects, and something about the energy that makes the projectile is "magnetically", for lack of a better word, charged, comes back together, and regains the shape of the beam with all the energy combined. tl;dr.
Edit: I got down to drawing the new Nemesis, and added a surprise for all you guys who care.
First time ever drawing a female, so go easy on me. Yeah yeah, I know you can't see the eye with hair in the way, however, the picture just didn't make sense if you didn't see the entire eye. Once again, please excuse the horrid largeness of the image.
and a bonus, which I'm not too sure was already posted here.
Cute little .gif. Presumably it goes with the event: "Jammed it into Curly's mouth."