were they possesed? what happened to those who survived, what did they say afterwards?
this is a historical event that I just don’t understand.
While you wait for fresh answers from qualified experts, you may be interested in a past thread related to the topic.
Is there any consensus about what was going on during the 'dancing plagues' of the middle ages, particularly in Strasbourg in 1518? What are the major theories about it? with a detailed response by /u/haujotam that describes possible causes for the Dancing Plague.
I could not find any discussion about what affected people thought about it after the fact, though.