CREATE TABLE table_8729 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" TEXT)

What is the round when the loss came with a record of 2-4?
SELECT "Round" FROM table_8729 WHERE "Res." = 'loss' AND "Record" = '2-4'
SELECT "Round" FROM "table_8729" WHERE "Record" = '2-4' AND "Res." = 'loss'