The argument is he used excessive force though, that isn't really covered by stand your ground, that just means that him not retreating back inside can't be used against him. Stand your ground doesn't give him license to beat Ryker to death.
When I did my training and paperwork and stuff for my licence for gun ownership as sports shooter in Germany this was a huge topic.
Generally and to my everlasting surprise German law is quite akin to "Stand Your Ground"
The instructor, former policeman, put it like that:
Whenever you have the option to retreat, do it. If you cannot or have to help another person, do it with the minimum amount of force and/or weapons necessary.
One example was, same situation of attacker shot by home owners, one was acquitted by the court, the other was slammed.
The only difference was:
Shooter 1: shooting 4 times in rapid succession.
Shooter 2: shooting 2 times, short pause, shooting once again.
Both attacker dead.
Shooter 2 slammed for manslaughter, the short pause was seen as a moment he had the option to think about the situation and that he made the conscientious decision to fire the killing shot.
To put it differently: Each and every situation is to be investigated and evaluated bit by bit.
That MC was let out of custody and the interview was handled like it was should mean MC is out of the fray from the
law side. ( As long as Ryker survives)
Does not mean that he might still be in for "private" lawsuits. Or Wendy when it comes to Kenji.
Probability of success? No clue.
Considering the backup he has...
Or, another option, let`s just lean back and see how BD will let it play out