William's Accelerated Reflexes activated the moment that Yuhe used the Primary Law of Water, but just like against the Domains, there was nowhere to dodge to without leaving the Boss Room! Retreating would place his back against a wall and moving to either side was just as fruitless!
Not only William, but the other students realized the situation had become too dangerous for them to remain. They had no choice but to descend the nearby stairwell and return to the 9th floor until the battle ended.
While the students watched the battle from the 9th floor, William created a Starmetal cocoon to protect himself from the raging tsunami that was now just a few meters away.
Even with the Accelerated Reflexes Bonus Effect, the speed of Yuhe's attack far exceeded what even an Initial Deity Realm Cultivator could achieve. Unless William used other Magic Affinities, Yuhe was set to maintain the advantage for the remainder of the fight.