Transitions are especially hard if you’re going from a highly preferred activity to a less preferred activity. For example, Luna really likes swinging. So that is a highly preferred activity to her. If you have to then get off the swing and get in the stroller, she would be transitioning from a highly preferred activity to a less preferred activity.

Or better yet, do you remember the video of them in their yellow dresses where Luna smacks Cassie? Luna wanted to line up the rocks. That is a highly preferred activity. I’m assuming that Cassie just swept her up to take a video of them in front of the sunset. Luna did not want to do that lesser preferred activity and she lashed out.