Reuven is very intelligent. He often is impulsive and judges others without thinking of the consequences. He helps Danny through his struggle with his family and his religious obligations.
A complex character can have multiple roles in the story. They may have various strengths and weakness that play out in the story.
Explanation:
He has a variety of traits in the story and many sides to his personality.
It would be rainsford falling off the yacht because at that point you wouldn't know what is going to happen and that eventually turns into a series of events.