Greedo is still a shooter, even if he never got a shot off. He had a gun out, expressed intent, even a preference, to kill and didn't shoot because he was dead

Anyway, "first", in the chronological sense, does not exclusively mean before others of its kind, it means before anything else, preemptively. If you are looking for something, and you say "first, let's look in that spot" and that's where you find the object of your search, you are not a liar for saying first, when that is the only place you look. If you say "try this first" and it works, you're not going to try anything else.