Schema: CREATE TABLE table_name_2 (opponent VARCHAR, event VARCHAR, method VARCHAR)
Question: Which opponent's event was sb 24 - return of the heavyweights 2, and had a method of TKO (knee and punches)?
SQL: SELECT opponent FROM table_name_2 WHERE event = "sb 24 - return of the heavyweights 2" AND method = "tko (knee and punches)"