Morale was one of the keys to winning the war, and what Tang Shaoyang did was to lower the enemy's morale. Not this was necessary since they were winning anyway, whether the enemy's army had high or low morale, but he just wanted to end this quickly. He did not want to waste his time and missed the tower summoning on Earth.
Of course, another reason was that the Legend Rank posed no challenge to him. After a single fight against Robert Kingsley. He had killed the man called Powan as well and reached level 2712. His level increased by killing another Legend Rank, and what, he still could not advance to the next rank. At this point, he had given up to reach the next rank, even with the Left-Wing Guardian.
Sure enough, chaos formed within the Lionax Kingdom's army. Great unrest spread out among the knights and with additionally the confused commanders because of Rosalie's appearance, the knights were unsure what to do, and their mental state was unstable for sure.
