CREATE TABLE table_52439 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

In the game where the home team scored 19.21 (135), who was the away team?
SELECT "Away team" FROM table_52439 WHERE "Home team score" = '19.21 (135)'
SELECT "Away team" FROM "table_52439" WHERE "Home team score" = '19.21 (135)'