Grey was startled when the two-headed snake turned to his direction. Without being told, he knew the snake wanted to get serious with him now.
He hastily retreated, but the snake chased after him and sent out a powerful stream of flames that almost knocked Grey to the ground. Grey was in the Fusion State, but he had no choice than to use his Teacher's talisman to help boost his speed so he could escape from the snake's attack's.
When Grey got a good distance away, in hopes of drawing the snake away, he was left disappointed when the snake quickly turned around and headed in Void's direction. It was already a Rank Six Magical beast, so it was very smart. It quickly picked up what Grey wanted to do, so it played along and when Grey moved further away, it rushed in Void's direction.