After the conversation Liu Yang had with Rosella, he managed to come up with a good plan to deal with the assassins, but the members of his group need to be strong enough and skilled to perform each of their tasks.
So, Liu Yang started training them so they can improve their combat skills and learn the right moments to use their skills.
The group continued training during the night against other nocturnal creatures, Liu Yang moved the carriage to another location and they found another group of nocturnal creatures. They did intense and tiring training.
After that, they returned to the same place as before. Liu Yang wanted to fight again in the same place.
This time, the goal was not to kill the nocturnal creatures but to learn how to control the battle so that they can last longer and create favorable situations when fighting against the assassins.