"In my world, there are elementals and humans. Elementals have wings and halos, like my vines or his sparks, and are very magically powerful in our own element; magic-using humans have affinities for multiple elements, but can do much less with them than we can. Magic-using humans can also create amulets that bind elementals to obey whoever last touched them. Elementals can't interfere directly at all with our own or others' amulets. Humans consider it unsafe to let any elementals go free, and we're very valuable and useful for doing magic with, so they capture any of us that they find. My friend and I are part of a university collection, and we've been trying to find someone who seems like they might be able to steal and break all the amulets in the collection. But I don't know if it's possible to break an amulet without using my world's magic to do it."