A state appeals panel reversed a man’s mob-action conviction because there was no evidence he willingly participated in what prosecutors described as a modern-day duel.An innocent bystander was killed during the July 9, 2009, shootout between defendant Tyrone Barnes and an unidentified man in black. It is undisputed that a bullet from the unknown shooter killed Simeon Sanders.Barnes was tried and acquitted of felony murder, but convicted on a count of armed violence predicated through mob action.But the 1st District …