Rosencrantz and Guildenstern Are Dead Lesson Plan

Why are Rosencrantz and Guildenstern upset about their game of Question Tennis with Hamlet?

Hamlet refused to play by the rules of the game. While Guildenstern insists that they won, because Hamlet broke several of the rules they imposed on the conversation, Rosencrantz knows better. To his mind, they lost because they failed to ascertain what had driven Hamlet mad. While Guildenstern tallies the score, Rosencrantz believes that the point of a conversation is not to win, but to understand each other. Since they failed at that, they've failed at their aim.

Why are the Players so angry at Rosencrantz and Guildenstern, and what does their anger say about the nature of...