CREATE TABLE table_9647 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Round" FLOAT, "Time" TEXT, "Location" TEXT)

What is Round, when Method is 'submission (reverse armbar)'?
SELECT "Round" FROM table_9647 WHERE "Method" = 'submission (reverse armbar)'
SELECT "Round" FROM "table_9647" WHERE "Method" = 'submission (reverse armbar)'