All Things for Setting Up Monsters

[Your Computer]

The video covers enemies repeating patrol without the need of collision techniques. If the monster finds it difficult to find its way back to the path node it left before chasing the player, then chances are you don't have enough path nodes in the environment.

As for lurkers, they too rely on path nodes to get around. However, you don't tell them to move to a path node. They simply head towards the nearest path node where the last sound that they are capable of hearing was heard.