Nanoha - you've got it mostly right.
"Discovery" in this case is more like, "look what I found!"
The word "Aim," for all intents and purposes, can be translated as "intentionally" or "purposefully" in this instance.
The last line translates roughly, "I don't think smoke can move like that. LOL."
While I speak/read/write Japanese fluently (I sure hope so, since I am Japanese), I'm not exactly the greatest translator.