Once a player crosses the line with a comment or hard foul in the NBA, you know it's on! Muscles will tense and sweat will fly—as players strike their best "hold me back!" pose and try to look like they're would to kick some serious ass if only their teammates and coaches would let go of them.
In hockey games, the fight mode is one of the best, and you're wise to go right in for the KO blow. In basketball games, the point would actually be to avoid the fight while continuing to look crazy and menacing, thus ensuring your "tough guy meter" remains at full strength.