I think Thunderbolt, I think of Pikachu...then I try to see it as a harpoon and I go "...that makes no sense..."
But then I realize that the light harpoon gun used to have the word "electric" in it somewhere in either the name or description (I think about the cables.)
And suddenly...it makes sense.
And it's obviously a hint that Muse has taken what Blizzard couldn't do, and is making StarCraft Ghost.