Making up his mind, Situ did not stay but rather moved towards the furthest peak, even though the rain was capable of allowing thunder to strike him, it was better to do things the right way. Since the Taixun Demon Sutra could allow him to consume any energy then he might as well take the risk and do things the proper way by refining lightning power in the end.
He had the need to become strong and the same time seemed to be more aware that the place was dangerous, if he did not take up the initiative to improve he might end up dying instead. This was true especially when he thought about the situation where he almost died from the bird, it made his resolve stronger.