Barrier troops were soldiers whose job it was to kill any comrades-at-arms who attempted retreat or failed to fight well.
YOU COULD HAVE FOUGHT THEM BACK SON
YOU'VE TOOK THE LAST BITE OF MY TONGUE
YOU'RE GONE, GEORGIAN!
YOU'VE CAUGHT THE LAST DOUBT
LOST YOUR MARK
YOU COULD HAVE FOUGHT 'EM
WHY NOT SHOOT YOU? ...FIGHT YOURSELF!
YOU'VE GOT THE RIGHT TO LOSE THE FIGHT
OR GET SHOT BY ME!