That fucker planned every part. He had carts in the hallway with cameras. He rented two adjoining rooms, he had previously hauled up all his many carts of equipment to his two rooms.
He picked the best 2 rooms facing the concert venue
He picked the 32nd floor, the height that was most likely to richocett at the best angle
@Vin53 That just shows you that while you have your own plans, someone might have some plans that will destroy yours. The people had plans to have fun at a concert. Lots of them ended up dead or wounded.
