Peter hid behind the church hall. Through the observation window, he could see the two mutants conducting a trade in the hall.
The price that the two mutants wanted was too high. Thus, they were discussing something. Peter's idea was that since the two mutants needed points, he happened to have a large number of points on hand that he could use them to exchange for the information that the mutants had obtained. If that did not work, he could still control the two mutants at once.
Peter had previously led Donna to massacre the Hassan family, which sold slaves, in Maple Leaf Town. For this reason, he had obtained a large number of treasures and a considerable amount of points from Hassan.
If Peter could use the extra points in his hand to deal with the two mutants, he did not want to use the power of the Thunder God in the Mechanical City. After all, if he alarmed the Virgin Mary, it was unknown if he could leave this place safely.