If the question is about the words "scuttled off" then the accurate answer would be imagery, more specifically, kinesthetic imagery, that is to say, imagery related to the vivid significance of the movement of the crab that implies both a physical gesture that reveals an emotional movement associated to that gesture. In literature, this is called "from motion to emotion". In this particular case, the movement of scuttling off implies that the patience of the crab is about to meet its limits and because the crab does no longer want to be subjected to an uncomfortable situation it translates its emotion into the motion of leaving. Furthermore, the following use of direct speech right after this motion completes the cycle of emotion to motion and then back to emotion.
In Act 1 Scrooge is more closed off and grumpy, he isn't really kind to anyone and doesn't care about Christmas at all. He is scared of Marleys ghost but shows little belief in the paranormal or what Marley is telling him. In Act 2 scrooge is frightened by the ghosts at first but eventually opens up a bit and listens to them. Eventually scrooge starts to understand the true meanings of Christmas and shows more emotion towards the situation. He is quickly brought back to reality and realization after being with all 3 ghost of christmas past, present, and future. He wakes up with a new meaning to Christmas and is kind and joyouss of the holiday.
