I found videos from 6-7 authors... But in none of them was this town taken; they all passed by through the ifrit pits.

Here is the answer, actually. I said: one person's walkthrough is not a dogma, but an example of how it can be done. The same applies to fire magic: WSW did not forbid taking it, and only with a very high level of skill and to satisfy one's ego can you complete the game without it.
I tried to finish that day from your save several times, in different ways - it turned out like this: if you move away to the side, the enemy still runs out and kills our heroes, and if you go further down the road, if he can reach you, he will kill you. And only if you run away very far, the enemy does not attack, but also does not come out of the town; he just sits there. I skipped several days, but he still didn't come out; he's lazy. Most likely, it's better to wait and come there later - maybe then it will work out. It's a pity that the heroes don't have Camouflage: it would be possible to deceive the enemy so that he wouldn't attack.