Rationalize all you want, but when the shooter started harranging the woman, the fight officially started. If the husband did not get out of the car to defend her, he would not have been much of a man.
It would help if you kept to the actual facts of the case.
The man was in the store, not in the car, so he couldn’t “get out to defend her”.
The shooter was backed away from the car when the man came out of the store.
The woman got out of the car and confronted the shooter when she saw her man coming up from behind, so the victim knew that his woman was actually bringing the fight to the man, not the other way around.
By appearance, it seems more likely that the woman got out to distract him while the man attacked him from behind.
The altercation started when the woman parked in a space reserved for handicapped people like the man’s mother. The man was reacting to that provocation, by defending his mother’s right to that parking space.
The FIGHT started when the woman got out of the car and approached the guy to distract him while her man came up from behind to blindside him.