Suspense

What technique from this passage of “The Black Ferris” by Ray Bradbury is used to create suspense?

“The carnival had come to town like an October wind, like a dark bat flying over a cold lake, bones rattling in the night, mourning sighing, whispering up the tents in the dark rain.

Peter and Henry ran to the lonely carnival grounds. The Midway was silent. The grey tents hissed in the wind like giant prehistoric wings. At eight o’clock perhaps, ghastly lights would flash on, voiced would shout, music would go out over the lake.”

Which suspense technique was used in this passage?

"The old preacher took up his bible again, but before he could start reading, he heard footsteps coming up the cellar stairs. He sat watching the door to the cellar and the footsteps kept coming closer and closer. He saw the doorknob turn, and when the door began to open , he jumped and hollered "what do you want?"