He had no time to prepare for high-energy attacks, so he had no choice but to shift his target to wolves.
The gap of strength has been exposed little by little over time, after the wolf's attack, although strong, but it can always be resolved by Sha'a Man's ingenious methods, and Guan Yu's strength, even if the attack hit Sha'a Man, also want to be absorbed into the sponge as well.
Sha A Man ignored Guan Yu's attack at all and let Guan Yu attack him. It was only a mental response second only to the wolf. After wolves, it's obviously a little uncomfortable.
The two men's stature is like...