Sooooo, as more information comes available, Miller was told to bring Miles gun back to him. Of which, Miller drove his vehicle that had the gun in the backseat & Miles took it out himself.
On one hand Miller could be viewed as inflaming the situation.
OR
On the other hand Miller took the gun away at first but after Miles insisted, Miller returned but did NOT touch the weapon.
HOWEVER, this is all due to what Miles did. Clearly, he is responsible. Lets stop assigning responsibility of someone else's actions to a bystander. Or to someone who may or may not have disparaged the situation. Certainly, Miller had better options. But that doesn't make him an accessory. There are 1000's of scenarios that come to mind when hind site is 20/20.