Pathfind

If the warden has a targetable entity, is not investigating any disturbances, and is otherwise idle, it pathfinds toward the closest entity, prioritizing players over mobs.

Has a sense of smell. It can detect and pathfind toward the general location of a player or mob through a "smelling" action.

If a villager cannot pathfind to its claimed site, both the site block and villager emit anger particles.