The masketta man symbolizes the devil. CIA has already completed his goal - securing dr Pavel, but Masketta keeps tempting him with more. At first he fails after trying to appeal to his greed "Don't worry, no charge for them", but eventually succeedes by appealing to CIA's pride - making him think he can go after Bane. CIA being the average sinner like us gives in, which results in his and his men's deaths. The story is a parable about the nature of sin and it's consequences.