It's obvious that Ruan Muhuan actually wants to see what kind of power these Immortals truly possess.
But such things can only be truly felt by personally engaging in combat with them.
The battle Wu Hen just had with that Immortal couldn't really be used as a reference. For all we know, that Snow Eyebrow Immortal Wu Hen treated like a ball might cause the entire Martial God Institute to break out in a sweat if they had to face him collectively.
"Well, this works too. Peaceful now," Ruan Muhuan said.
His people finally seemed to understand how to show respect to other members of the Human Clan.