Dyon had actually told Veles about the communication arrays, but it was difficult to comprehend a concept you had never seen or witnessed personally. Imagine you were a person who came from ancient times, and someone from Dyon's human world tried to describe cell phones to you and how they worked with the help of towers and satellites. Wouldn't you be confused beyond believe.
However, Veles and Laura both knew that it was too late to withdraw. If they slowed and Dyon deployed the barrier again, a large portion of their numbers would be completely trapped! They could only speed forward.
That said, Dyon had no intention of using the barrier again. It had served his purpose. Instead, his mind was completely focused on the staff in his hand and his mental fortitude was continuously drained.
Less than a mere moment later, a brilliant array appeared in the air, more dazzling that even the Viserion elder's fire dao.