Arthur poses as a stand-in sheriff to rob the Greys/Braithwaits. The gang attempts to ambush the O'Driscolls, which goes sideways when Arthur is captured and tortured.
Once the family catches wind, they ambush the gang. Sean is killed in the ambush. The Braithwaits kidnap Jack to retaliate after the Greys ambushed the gang in retaliation.
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From @gamingwithme