While monologue and soliloquy both theoretically mean 'single speech', a monologue is a speech given by a person in the presence of others, while a soliloquy is a speech given by a person who is alone.
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Do they give you any choices?
Manuel kidnaps Buck because he want to make money out of him by selling him. Manuel needs this money to fund his gambling habit, and also he has a large family to provide for.