By Chapter 3 in Lord of the Flies, Jack has already become single-mindedly addicted to hunting the wild pigs on the island. While Ralph is trying to stress the importance of keeping the signal fire going in the hope that a plane or ship will see the smoke, Jack can barely "remember what rescue was." Both Ralph and Jack were looking skyward, but for very different reasons. While Ralph was looking to see how far the smoke could be seen, Jack was eyeing the shady, downward slope of the mountain. As always, he was thinking of pigs. When he cried out, "Got it!" it was because he had just come to the realization that the shade was where the pigs could be found.
"Of course! They'll lie up there--they must, when the sun's too hot--"
Ralph, thinking of rescue first, hoped that Jack's cry was because
"I thought you saw a ship!"