When you have to improvise at length on a regular basis, you start using tricks. The greek chanters had their epithets (dozens of descriptions they could throw in depending on how many feet they had left in a line); C and I have <Size Adjective> <Color> <Gerund, usually locomotive> <Item of Clothing>. Along with any natural or artificial obstacle and any means of circumventing same that comes in handy. I think he's onto the pattern, but he still enjoys seeing how it plays out. Only two and a half years to go, and then it will be B's turn.