The Prince was placed in a difficult position as he tried to block Grey's attack. However, Grey uses his space element to make life a living hell for the Prince.
Even though the Prince also had the space element, he had difficulties blocking this particular attack. The sudden switch of attack from regular inscription attacks to the chaos orbs was just too fast, before he could even sense the space element coming to play, the attack was already in front of him.
He soon gave up the thought of blocking and started dodging the attacks. This way, there was no way Grey would be able to catch him off guard. His only problem was that he couldn't get close to Grey. The reason for this was that Grey covered himself with multiple chaos orbs. It was almost impossible for anyone to get close to him without being blasted by these orbs.
"If you know you're strong, come, fight me head-on." The Prince tried to draw Grey out of the encirclement of chaos orbs.