"go to it"

When Horatio says the phrase "go to it" in line 56, he says it with a satisfied tone. I think he is proud in what is going to happen to Rosencrantz and Guildenstern. It doensnt phase him that they are being sent to their death becuase they had a pointless role in the play the whole time. Like Hamlet said, all they were was sponges. I couldnt have said it better myself. Horatio feels the same way, and in that he is satisfied and may even find pleasure in sending the 2 of them off to their death.