"King of the Hill"

So, is hit-and-run prohibited or not?

Read the rules carefully. 2.2. Hit-and-run is prohibited: Your hero, attacking an opponent's hero, is not allowed to retreat in the first round of the battle if they cast any magic. This prohibition does not apply to the hero who is defending. That is, after casting Arcomage, Luna does not retreat anywhere, so everything is according to the rules. And in the next round, retreating is no longer prohibited, so in any case, it turns out to be a kind of hit-and-run.