Angered wardens pathfinding is very clumsy

Angered wardens pathfinding is very clumsy.

1. Create this structure and temporarily isolate the wardens and wait for it to get angry.
   
2. Clear the obstacles in front of the wardens.
3. Noticed that angered wardens won't find the target along the wall next to the target.
   

I know the warden is blind, but sound waves can bounce between matter, so once a creature emits a sound wave, the warden must be able to know the state of nearby structures, like a bat in real life.