Since Rainsford was found by the General so easily, the General wanted to have more fun and allowed him to go, which showed his smile. The General was a cunning man and he wanted to have more fun in the game so he gave Rainsford another chance to go and let him have another hunt. The General had something in mind and Rainsford thought he was going to die instantly and easily because he was up against the General.
Guesses is the plural form
Expressing the word bored without using the word bored means to have nothing to do, there is no excitement, or any emotions and you are sitting thinking of what to do