Members of the Santermo Clan usually stay in their Kingdom or traveling across the world for completing quests. If someone were found living or staying in a certain place, it was more likely to say that that group or individuals were exiled from the clan because of whatever reason may it be.
That was why Marco thought that the person they were currently facing was an exiled member of the Santermo Clan since the other party was using the special ability of the clan. And that was turning themselves into a ball of fire to gain greater power and control over fire.
But now, in all of a sudden, he would just learn from his trusted comrade that the enemy they were currently facing was from the Phoenix Tribe! How could he remain calm from that?!