What puzzled Bella after Jacob pulled her out the water?

After Jacob pulled Bella out of the water in the novel "Twilight" by Stephenie Meyer, Bella was puzzled by the fact that Jacob's body temperature was extremely high, almost feverish. This was unusual and unexpected, leading Bella to question how Jacob could have such a high body temperature. This moment foreshadows Jacob's eventual transformation into a werewolf, as werewolves in the Twilight series have higher body temperatures than humans.