Conversation so far:
what was Ric Flair's feud about?
Ric Flair often took the lead in the war against Scott Hall, Kevin Nash, and Hollywood Hulk Hogan, whom Flair immediately challenged for the WCW World Heavyweight Championship.
Who did Ric Flair challenge?
Hulk Hogan
How did the match between Ric Flair and Hulk Hogan go?
Ric Flair won only by disqualification.
Who was disqualified in the match between Ric Flair and Hulk Hogan?
Vader

Question: Why was he disqualified?
Self-contained rewrite: Why was Vader disqualified in the wrestling match between Ric Flair and Hulk Hogan?