Conversation so far:
what happened to mary decker, during the 1984 olympics?
Decker was heavily favored to win a gold medal in the 3000 meters run at the 1984 Summer Olympics.
did he win?
As a result, Mary Decker did not finish the race.

Question: why not?
Self-contained rewrite: Why didn't Mary Decker win the 1984 Olympics?