The funniest thing is that nothing would have stopped "Carneol" from sneaking up to Sarasa under the same invisibility spell. Then, the current situation probably wouldn't have happened.
I think they did a good job, the only mistake was with the forging, but they overcame it and won convincingly. /
/ That is, let me explain my thought. We leave from ???, let's say we kill the mayor and her immediate guard (being a squad without equipment and a bunch of helpless, clumsy guys, yeah, that's already funny in itself), and we are immediately surrounded by the Thai army, and that's just the best-case scenario. The worst-case scenario is that we are surrounded even before we reach the mayor./