"Hmm," Sam pondered while touching his chin. "What's the best way to break in?"
He was currently hovering outside a tall skyscraper. It didn't take him long to find this tower for two reasons,
First, this was the tallest building in the city of Los Angeles. Here resided the prestigious hero, White Walker.
Second, a few months back, he and Kiara visited this place to kill White Walker.
Sam couldn't help but remember that night. It was a fierce battle. Half of the whole city of angels was destroyed.
White Walker's ability was to disable other users' abilities. Sam never imagined taking him down would prove to be that difficult.
But oh boy, was he wrong. That ability was so impressive that Sam couldn't help but take it after they killed White Walker.
Anyway, the point is they went through so much trouble to kill White Walker because he was the protector of Los Angeles.