Xu Shuo stayed in Sars City because the message he delivered to the Order of the Sun Knights wasn't to bring the person... the dragon to the City of Light, but to Sars Cathedral instead.
The Holy See of Light has a cathedral in each major city-state, and where there is a cathedral, there will inevitably be the insignia of the Sun Crown.
In such a place, his power was stronger.
After all, one must not underestimate the strength of a giant dragon, even though Xu Shuo sometimes enjoyed taking big risks, and often floated off, he never gambled without preparation.
He had just arrived in the Sars City-State and had not yet received a message from the Sun Knight when he casually wandered through the marketplace of a different world.
This subspace map was vast, covering the entire human continent, even including the unknown seas and the farthest reaches of the Far North, consequently, its worldview was also very complete.
It felt like traversing a different world.
