ข้อที่ 9. As soon as I got to the closed door of the barn, I realized that something was wrong. Instead of the chewing noise of the dairy herd that at night sheltered there during the winter months, there was silence. I undid the lock that kept the huge doors firmly shut, pulled them open and shone my flashlight into the cavernous interior. Apart from some bales of hay, it was empty. The writer realized that the situation was not normal when he _______.