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One thing people tend to forget about is how their own behavior makes them appear to others. As Mas recommends, behaving like an authority figure can help influence others into recognizing that you are not the bad guy. Simple statements such as "stay back; he might still be dangerous," "you, call 911," and "is anybody hurt" provide a quick indication of your role, or at least enough doubt the delay an overeager responder from assuming you are the threat.