Set #2 comprises the three Earp brothers Virgil, Morgan and Wyatt fighting alongside their friend 'Doc' Holliday.
All three of the Earps are firing their pistols while 'Doc' Holliday wields a shotgun.  As befits their social status in Tombstone all four men are dressed in more sober, dark coats, collars and ties compared to their more casual 'cowboy' opponents.
Also worth noticing is the Colt Buntline Special carried by Wyatt Earp himself. This was the famous, long-barreled variant of the Colt Single Action Army revolver known for its 12-inch barrel and popularized by dime novelist, Ned Buntline who was said to have presented one to Wyatt Earp after a visit to Tombstone.
Although some sources dispute this story Hollywood and television have followed the reasoning of the great director of 'Western' movies, John Ford who said, "When it comes to the history of the Old West and the choice between the truth and the legend... Always go with the 'legend'!
What is definitely true is that both Morgan and Virgil Earp were wounded but did survive the famous 'Gunfight at The OK Corral'.