I doubt it. Only in the event Vavrik HAD to pass Loudon to leave the area. Vavrik had no compelling interest in remaining at the scene. Loudon was there to change a tire, with the vehicles owner who was a relative, and whom he had given a ride.
Indirectly, (given that he suspected Vavrik had slashed the tire), he was defending property by not leaving.
From the story, there was nothing to prevent Vavrik from using the vehicle to escape, which (imho) would have been the wiser course of action.
If corroborative testimony is tight and indicates that Vavrik was using the vehicle to threaten Loudon, it should be ruled a good shoot.
Daddy should learn when to shut up, though.
Sounds like her Dad was not only defending himself but his daughter from crazy ex boy friend.