Somewhere on the island, many hours earlier, a young teenager of about eleven years old was catching his breath on all fours on the white sand. Unlike Jake, Sarah or the two sisters, the first event had been nothing special for him, but swimming such a distance had not been easy because he couldn't swim. That young boy was Tim.
His Danger Sense skill gave him an almost unrivalled ability to sense danger and anticipate it. Even though his Perception, Intelligence and Extrasensory Perception had been nerfed when he entered the Sanctuary Bubble, it didn't affect his Aether Skill too much.
Like the Fireball lvl0 of the two sisters, it was a passive, automatic, effortless skill. He had no idea how this foresight worked and he didn't care. What mattered was that it worked.
Tim had died many times in the beginning, but despite his young age he had adapted easily. After all, swimming was supposed to be intuitive. Babies knew how to swim when they were born, just like most animals.