Jacob has a small but very important role in Twilight. After Bella flirts with him (as a way to get information), he introduces the idea of Edward being a vampire by telling her the Quileute legends on the topic. After Bella and Edward began dating, Billy takes Jacob to Bella to advise her against it, without, however, telling her why. She already knows. He is later seen crashing Forks High's prom under his father's orders to reiterate the same warning.