
Revealing mistake: In the last scene where Edward and Bella are sitting in the sunny field, Edward is not sparkling. (01:52:55)

Continuity mistake: Spoiler! When Victoria's head is popped off by Edward, who has killed her, her eyes are open. Seconds later, from another angle, her eyes are closed. (01:42:30)
Answer: It's a common expression. It means 'to take over'. So Seth will take over in protecting Bella in the morning for him.
Anastasios Anastasatos