After obtaining the information he needed, Tang Yin's next goal was to increase his cultivation. He wanted to reach the 6th stage of the Qi Transformation Realm before going into isolation to do a few things.
Tang Yin's sixth Spirit Flame was already near completion. He only needed the Spirit Flame of one more Qi Transformation Realm cultivator to thoroughly complete it and reach the 6th stage.
There were a few Qi Transformation Realm cultivators in the memory of the middle-aged man and the youthful cultivator. But they were all part of some Demonic Sect or organization.
Normally, Tang Yin would not have any qualms about destroying a sect. However, he only needed to kill 1 Qi Transformation Realm cultivator. Not a group of them.
Destroying a sect would bring attention to him, whilst killing a rogue Qi Transformation Realm cultivator would most likely be neglected by everyone.