Conversation so far:
who or what are the Warrens?
Ed and Lorraine Warren on the Sally show in 1992.
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?
" to describe his work, his evidenced-based investigations of paranormal events has not yet uncovered any miracles, ghosts or monsters.
Did he work on the show?
CANNOTANSWER.

Question: What did the warrens have to say?
Self-contained rewrite: What did the warrens have to say