"First, I'm no longer content with just having the head of the orc king. Secondly, I have changed my mind about eliminating the orc king army" Simon answered.
The offer that he had given to Berigard before he went to the night of the moon dance, was that he would collaborate with the orc general to take the head of the orc king while at the same time he will take care of the huge orc army with his magic in return for the orcs to never step a foot in the eastern region of the forest.
On the surface, it might look like he was losing out incredibly in that exchange after all he was doing most of the work at a very less reward making even the listener Berigard suspicious.
However, what Simon was after was not any reward but the experience he is going to earn after killing a disaster class being and the thousands of orcs.
