Grace was riding Mathiyus, and despite his reluctance, Fortuna made him do it. Valerian and Priscilla were mounting their wraiths and the four men were left inside the cave, tied with vines. The entrance of the cave was also covered with vines so that no wild beast comes and make their meal. He did this when Grace had left with Mathiyus so that she does not discover his actions.
Grace provided them directions when they were moving and quickly came to the place where they had encountered the swarm of fire ants. Priscilla said, "We can track them from the signs they left."
Valerian nodded and growled to communicate with Mathiyus and they moved, his voice was low and only the beast could hear it. This was a technique he learned back in the academy. Fallax taught him the words of the wind. This sort of technique needed one to channel mana in their throats and manipulated the vocal cords.