If you go all confrontational on Charleston but fail to intimidate him, he orders his diggers to attack. But they pay him no heed, because the relevant dialogue transition has no actions. Since he also comes equipped with WTRUNSGT, it would seem appropriate for him to bugger off and leave his men to die drive off the fool PCs.
ADD_TRANS_ACTION charle BEGIN 13 END BEGIN 0 END
~Shout(99) EscapeArea()~ //Diggers turn hostile upon hearing 99