The reason why Su Mo attacked the Fourth Priest first and not the Grand Priest was because he didn't want to face a surrounding attack.
After all, although he was confident, he wasn't sure of the Grand Priest's strength.
As such, he wanted to get rid of the Fourth Priest first before he focused on the Grand Priest.
Su Mo swung his sword and a large Sword Qi drew through the sky. The Chaotic Sword Qi in it was as fast as lightning and it instantly closed down upon the Fourth Priest and the other Sorcerer Tribesmen.
In the blink of an eye, the Sword Qi reached its targets.
"Not good!"
Under the forces of the Sword Qi, the faces of all the Sorcerer Tribesmen fell. There was no way they could block the attack and hence, they immediately dispersed in all directions, leaving the Fourth Priest behind.
However, the 4 Sorcerer Tribesmen were all Rank 9 Martial Honorables or Sage-to-bes and they could not escape Su Mo's blow.
Kacha~~