Final answer:
Edward saves Bella in the first Twilight movie by using his supernatural strength and speed to stop a skidding van from hitting her.
Step-by-step explanation:
In the first movie of the Twilight Saga, Edward saves Bella at school by exhibiting inhuman speed and strength. During a particularly icy day, Bella is nearly hit by a skidding school van. Edward rushes to her side and stops the van with his hand, preventing it from crushing Bella against her own truck. This is the first major indication to Bella that Edward is not a typical high school student but instead has supernatural abilities, leading her to later discover that he is a vampire.