In Prince Caspian, the group of Pevensies and their D.L.F. are attacked by a bear, which Trumpkin quickly shoots dead. Susan was slow to shoot, wondering if it might have been a Talking Bear. While the boys and Trumpkin are skinning the bear for its meat, Lucy and Susan have the following exchange:
"Such a horrible idea has come into my head, Su."
"What's that?"
"Wouldn't it be dreadful if some day, in our own world, at home, men started going wild inside, like the animals here, and still looked like men, so that you'd never know which were which?"
"We've got enough to bother about here and now in Narnia," said the practical Susan, "without imagining things like that."
Any comparison between events actually happening in the story in Narnia and imagined equivalents in our world immediately makes me think of the allegorical aspect of the Narnia stories. Does this paragraph refer to anything metaphorically? Perhaps something that Lewis believed was already happening, or at risk of happening, in our world?