Table: fighter_results_4
Columns: res
record
opponent
method
event
round
location

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 fighter_results_4 WHERE "event" = 'sb 24 - return of the heavyweights 2' AND "method" = 'tko (knee and punches)'

Question: Which method had Travis Fulton as an opponent?
SQL: SELECT "method" FROM fighter_results_4 WHERE "opponent" = 'travis fulton'

Question: Which opponent had a round of more than 1 and an even of PFP: ring of fire?
SQL: SELECT "opponent" FROM fighter_results_4 WHERE "round" > 1 AND "event" = 'pfp: ring of fire'