What's the record of the UCS 2 - Battle at the Barn when the round was n/a?
CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "event" text,
  "round" text
);
SELECT "record" FROM "mixed_martial_arts_record" WHERE "round"='n/a' AND "event"='ucs 2 - battle at the barn';