Wood is perhaps the element most vulnerable to lightning. So in a fight, he is sure he can defeat her even though she has a more advanced cultivation than him and is older than him.
But he doesn't want to fight her because Sword Flash told him to be the reasonable one. His job is to make sure that no matter what happens, the Blood Skull sect will remain intact.
Sword Flash has made a lot of preparations for the sect. The part he is to play is to hold the fort, not fight with the other patriarch of the sect or run around the Five Veins Region provoking fights.
This job seems simple, but it is actually a very difficult thing for him to do. For one, he has been looking forward to beating Evergreen for a while now.
Sword Flash's absence is a good opportunity to fulfill this dream. But he has to hold back and not beat her up. It is very difficult for him to do.
