[zzhk]

I don't think Melqart broke a sweat against the Boar actually, he is the prototype for Heracles after all.

As for his clubs, they were already summoned and out in the air, so having enough energy to launch a final attack isn't implausible. Besides, getting killed afterwards doesn't really matter as long as you can revive -- as evidenced by the double-KO with Verethragna. The point is, Godou simply has not dealt enough damage to Melqart to slay him.

Ultimately, since this is a prequel, it's already set in stone that Godou was not going to defeat Melqart completely to gain an authority.