The swarm of the rats posed no trouble for Tang Shaoyang and Li Na. They wiped out the swarm of the rata after five hours long of battle. The number of rats was about the same as the two ant colonies' army.
It took longer because Tang Shaoyang was giving more rats for Moon and Li Na to kill. He was there to maintain the condition to not get too dangerous for the bear and the girl.
He could take them all on his own, but he did not want one of the unique classes of his empire had to be stagnant in her growth. He was doing the best to help his people to grow stronger. One thing he learned after he became the head of many people.
Five hours long of battle, it was nothing for Tang Shaoyang. But it took a great toll on Li Na. She was drained, her steps became slower, and her breath was short. He could tell that by matching her pace.