What was the away team score for the game with a crowd of 5391?
CREATE TABLE "round_3" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "crowd" real,
  "date" text
);
SELECT "away_team_score" FROM "round_3" WHERE "crowd"=5391;