Gale only moves on night 5. He is the hardest to beat because on top of being lightning fast, he's strong as well. The only way to keep him away is to find his spider, press on the back, and let it run away. Hence, Gale will chase after the spider. The spider is Marty. The only way to get Marty is to leave the office to search for him OR get Sobi to go get him.