The fourteen Soul Forging existences from the Heavenly race were completely focused on escaping and defending from the ferocious attacks of the Magi.
They had contacted Oliver the moment Martin was captured, and although the Duke knew that leaving the Heavenly Guard unsupervised was extremely dangerous for the continent, he could not leave fourteen of their strongest warriors in such a dangerous situation, so he along with the rest of the Soul Forging existences guarding the place, left to their rescue.
Unfortunately for the Heavenly race, the distance was immense and unlike Martin who could use his Law Avatar to increase their speed, Oliver did not have that ability so he could only focus all of his energy on his spells to increase his momentum.