Which type of noun is crew?

Label the different parts of the stage. downstage stage left audience stage right upstage

[he] let his gaze wander to the swirling water of the stream racing madly beneath his feet. a piece of dancing driftwood caught his attention and his eyes followed it down the current. how slowly it appeared to move! what a sluggish stream! what contrasting words are used to describe the stream in this passage?

How does the author create a surprise ending? cite evidence from the text to support your answer.