What was the result for the round of 4 leg 2 when the attendance was less than 20,371?
CREATE TABLE "2004_05_middlesbrough_f_c_season" (
  "round" text,
  "date" text,
  "opponent" text,
  "venue" text,
  "result" text,
  "attendance" real
);
SELECT "result" FROM "2004_05_middlesbrough_f_c_season" WHERE "attendance">'20,371' AND "round"='4 leg 2';