Research finds that 3rd parties most likely intervene in fights when drunk men are mutually aggressive, and were more than twice as likely to intervene in a non-aggressive manner. The most frequent aggressive incident (male pursuing a female), or 1-sided aggression between men, triggered few interventions.
Researchers think mutual aggression triggers the most intervention because other research shows that bystanders intervene more when the situation seems more dangerous. But its also possible that avoiding embarrassment compels.
