39-11-402. Criminal responsibility for conduct of another.
A person is criminally responsible for an offense committed by the conduct of another, if:
(1) Acting with the culpability required for the offense, the person causes or aids an innocent or irresponsible person to engage in conduct prohibited by the definition of the offense;
(2) Acting with intent to promote or assist the commission of the offense, or to benefit in the proceeds or results of the offense, the person solicits, directs, aids, or attempts to aid another person to commit the offense; or
(3) Having a duty imposed by law or voluntarily undertaken to prevent commission of the offense and acting with intent to benefit in the proceeds or results of the offense, or to promote or assist its commission, the person fails to make a reasonable effort to prevent commission of the offense.
I haven’t looked hard for Georgia’s corresponding statute, but in TN this is the hook that would determine whether you catch Bryan. Part 2 seems most applicable, IMO.
Again it’s not GA law, but in TN the intent and aid apply to the aggravated assault. I think the case against Bryan would be more favorable to the defense, based on my limited following of the facts, if they were being tried in TN. That of course is worthless analysis, but might help somebody find the relevant GA law.