Teresa asks Thomas if they should get inside of coffin things, hoping that maybe those will transport them. Sounds reasonable.
But just as the kids contemplate this, the coffins swing open. A misshapen arm hangs out the side of one, and then a monster walks out. It has light-bulb-like growths all over its body, and it's roughly human-shaped, though taller than the Gladers.
Pretty soon, all of these monsters are surrounding the Gladers, and blades shoot out of their fingers, toes, and shoulders.