Conversation so far:
who or what are the Warrens
Edward Warren Miney and Lorraine Rita Warren were American paranormal investigators
What do they have to do with Nickell
His insistence on documented facts led to a heated exchange with Ed and Lorraine Warren on the Sally show in 1992
was Nickell an actor
Nickell is an American prominent skeptic and investigator of the paranormal.

Question: Did Nickell think they were lying
Self-contained rewrite: Did Nickell think the Warrens were lying about paranormal activity?