As Melisandre led Evelyn around, the groups of humans from the Tyrannis Union chased after them in a bid to capture Evelyn. The main target of this entire operation.
However, while it may have seemed that all the people gathered to bring down the Roost were working in concert, that could not be further from the truth.
The Tyrannis Union was a loose alliance of many sects that each held their own spheres of power and ideologies. Far from a monolith that moved towards a singular goal.
At times the sects even fought amongst each other, and the weaker ones were crushed and absorbed. And this battle against the Roost was no different.
Each sect was participating for their own glory and advancement, and the greatest achievement to be won was capturing what many had come to call the Golden Owl.