Well, it must have been the costume.

Tonight after dinner, we were eating our ice cream when Sergeant Tanner told us he is leaving in the morning. He says he wants me to follow him back to his area after breakfast, and that he has something for me. I'm sad he's leaving but I hope it's good. The ice cream, in case you were wondering, was Neapolitan. I don't know how that fits Dr. Arkwright's theory.