Lt. Colonel Mitchell and Dr. Jackson in “Unfinished Business”

Hey, has anyone stopped to figure out how this thing might work? I mean, how do you kill something that's pure energy?

Well, Merlin's research said nothing about killing. A more accurate translation would be "neutralize" or "cancel out".

Well, that still begs a lot of questions. How do you aim at something you can't see?

Clearly, it can't be a weapon in the conventional sense. See, ascended beings transcend ordinary space time as we know it. This device would have to do the same thing.

In other words, you have no idea what it might be.

Yeah, pretty much.