Conversation so far:
What was the Pine Tar incident?
Yankees manager Billy Martin cited to the umpires a rule that stated that any foreign substance on a bat could extend no further than 18 inches from the knob.
What was the purpose of putting a foreign substance on a bat?
In the top of the ninth inning with two out, Brett hit a go-ahead two-run homer.

Question: Did he have a substance on his bat during this game?
Self-contained rewrite: Did George Brett have a substance on his bat during Pine Tar Incident game?