Frankly speaking, Sheyan was pretty annoyed at this contestant mob.
They were unable to accomplish anything but liable to spoil anything, like house flies that constantly bugged the soul.
If not for Rivendell prohibiting acts of violence, Sheyan and Reef would've started a massive massacre already.
In the midst of multitudes of enemies and few friends, Sheyan could distinctively notice the obvious cracks within that temporary party. As for the obvious crack, it was clearly due to the absence of a strong party leader. That was the opportunity Sheyan would seize.
Despite battling a party with half the members being Growth-Hunters, they would still win! This sounded rather far-fetched but it wasn't as complicated as it seems.