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Many, many, years ago I was in a similar situation. This was in a state without concealed carry for average Joes and it was long before cellphones.
I too, was being pursued by an irate motorcyclist. I have no idea why he was so angry.
I did not want him to follow me home.
When it became obvious that he was not going to go away, I changed course and drove to the local police department.
When I pulled into their parking lot, he continued on - flipping me off as he went.
I sat there for almost an hour before I went on my way. Never saw him again.