CREATE TABLE table_51911 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was the away team at Windy Hill?
SELECT "Away team" FROM table_51911 WHERE "Venue" = 'windy hill'
SELECT "Away team" FROM "table_51911" WHERE "Venue" = 'windy hill'