While I agree that it would have been wise to stay in his car just to avoid a confrontation, my point is that he has no legal obligation to stay in his car, and getting out of the car should have no legal bearing on the case. He has the right to speak to Martin, there is no legal reason he should not.
I will go even further and say that he may have had some reasons to get out of the car such as: perceived neighborhood safety, potential crime reduction, and preservation of his property values since he owned a home in the neighborhood.
While getting out of the car and confronting Martin may not have been prudent, it is not an unreasonable action.
Do you have a CCW? Ever taken a CCW class? A CCW is a privilege. Extra responsibility comes with this privilege. Your legal “strategy” would be analogous to seeing a pedestrian and running them down anyway because you had the right of way. It's not going to fly.