CREATE TABLE table_27893892_2 (opponent VARCHAR, game_site VARCHAR, week VARCHAR)

what was the opposition where the field is waldstadion during time 6
SELECT opponent FROM table_27893892_2 WHERE game_site = "Waldstadion" AND week = 6
SELECT "opponent" FROM "table_27893892_2" WHERE "Waldstadion" = "game_site" AND "week" = 6