Yang Yi and his team arrived at the location.
A fairly large building with a quadrangle structure, surrounded on all sides by buildings enveloping a smaller construction in the middle. It was not very tall, with only six floors. In Paris, there are many old buildings with a bit of history and structures similar to this one.
To block someone, one must first understand the building's structure. It doesn't feel particularly striking in photos, but upon arriving on the scene, Yang Yi realized it would be impossible to seal off all exits and catch someone inside like trapping a turtle in a jar.
The building was too large, and they had too few people; they could only search slowly.
Moreover, the trouble with such a building is the numerous exits since storefronts with their own entrance doors lined the streets on all sides of the building. If they were to search slowly, there's no telling how long it would take.