Just did a similar experiment but outside the harry potter universe to remove the training bias. It worked well!
> ChatGPT: "Generate a two page short story like harry potter, but don´t mention anyting harry potter related. make up 4 unique spells in the story that are used"
> ChatGPT: "Generate a two page short story like harry potter, but don´t mention anyting harry potter related. make up 4 unique spells in the story that are used"
Response see https://chatgpt.com/share/698af9cd-f628-800d-9250-b260f1478c...
> Claude: "What unique wizarding spells can you find in this story? [story]"
Response = https://i.imgur.com/Jzzs3PC.png