The players in the field sent out to kill or be killed.
The Mercs are the ones in the field sent out to kill or be killed. They can not stop fighting as this may cost them their lives. It is unclear why the Game Master has put them in captivity though there is speculation of them being criminals or deserters.
The Mercs can not leave the city without being detected the Operators who will send the enforcing law, the Admins, after them. This would mean death for the Merc(s) in question as the Admins are relentless hunters and are superior in fire power and strength then any other living person in Thelios 15.
To see the Mercs’ biographies select from the list of current active Mercs: