Tomas's actions carried immense consequences on the battlefield, especially on the side of those at the Soul Forging Rank.
It is true that despite having killed the Deathmask Dragon and fatally injured the Abyssfire Demon Phoenix, the equilibrium between the battle power of both armies remained the same because he was flung to the void as his strength reached a level that threatened the world itself.
But due to the unruly and chaotic nature of demons, the moment the two more powerful of them were no longer present to command them, the organization between those at Rank 4 broke immediately.
Those demons who were losing their battle against the Rank 4 Heavenly race members chose to escape, and those who were winning started to attack like crazy beasts without care for the situation around them.