By my understanding, Castle Doctrine and Stand your ground are two entirely separate things, so under your roof or curtilage is irrelevant. That said, If I return to my residence after my child has called me saying someone has broken in, park in my OWN driveway behind a vehicle I don't know and then ventilate the person driving close enough in my direction to sideswipe my vehicle, there is not a jury in NC or SC that will vote to convict. That's not re-initiating an encounter while the bag guy is trying to escape. That is employing deadly force to stop a violent attack. They may have discontinued efforts to unlawfully enter the residence, but they surely haven't stopped offering deadly force as they drive a vehicle at you. Even if the law requires one to attempt to retreat before using deadly force and no castle doctrine or Stand your Ground law exist, there are always caveats that add "unless retreat is not available or would increase your probability of injury or death" Trying to run from an attacker in a car is the definition of that.