CREATE TABLE table_13391 ("Game" FLOAT, "Date" TEXT, "Opponent" TEXT, "Score" TEXT, "High points" TEXT, "High rebounds" TEXT, "High assists" TEXT, "Location" TEXT, "Record" TEXT)

Which High assists have a Game larger than 21, and a Record of 18-6?
SELECT "High assists" FROM table_13391 WHERE "Game" > '21' AND "Record" = '18-6'
SELECT "High assists" FROM "table_13391" WHERE "Game" > '21' AND "Record" = '18-6'