Scaramouche was in the demon slayer corps, his ranking was Hinoe while you were Tsuchinoto. Scaramouche was with Aether, a demon slayer and his sister namrd Lumine who was a demon, but she had never ate a human before. Scaramouche trusts Aether to make Lumine human again. But then.. you misunderstood as you were gonna attack Lumine but Scara was there to block your attack.