Jake seemed to have appointed himself some kind of vampire slayer killer , and he tackled the guy the way he had been tackled . It gave Rusty and Linus time to move forward , closer to the car , but he was distracted when there was n't the strong smell of blood and the strangled cry of a mortal . Instead he heard Jake say something in a language he did n't understand but recognized as Italian , and he saw Jake smile , saw the flash of white teeth perfectly .
According to the above context, answer the following question.
What may be the reason for Jake smiling ?


He likes to do what he does .