Why not report it!
You might save someone elses life! That is what is wrong with America today! People afraid to report things when they happen or after.
If you legally are in possesion at the time which I believe you were! In this situation being retired LEO myself your situation certainly complied with the requirements to protect yourself! In fear of serious bodily injury or possibly even death! You do not have to say "I pointed it at his chest"! Just that he saw you had a weapon and fled! As simple as that! Why wait until they do attack someone to tell your story to the police when it could be too late for someone?
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."
-- John F. Kennedy