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One time I rolled down my window to tell a similar road rager to pass me which only escalated the situation. Stupid, I KNOW. As though one can reason with an angry man in a 3 second conversation. A quick glance and evade is the best option.
Another key from the original post was when you called 911 on your phone so the rager knew LEO were on their way. Thank God we can take necessary measures to protect our families from some of these restless souls.