Ye Feng thought that, but he didn’t want to take any risk in this critical situation, by teaching her Immortal Cultivation Technique.
Moreover, Long Wan’er was one of the members of Dragon Clan of this Martial arts world. And not by any means, Ye Feng could completely trust her. If he would try teaching her this Immortal technique, and this would come in the knowledge of Dragon Clan, then who knew what would be its consequences?