Their directive is to not kill anyone in the past so to not adversely affect the future.
The Travelers had leaked either a highly toxic gas, or genuine nerve gas. All the Travelers had been given the antidote.
Major Gleason left one guy behind, to monitor the site, when he took Dr Delaney back to his HQ. Two of our Travelers tried to warn him to run away, but when the gas hit him he died in mere seconds. (I think this suggests they released actual nerve gas.)
Gleason and his men weren't wearing gas proof suits, and had not received the antidote. So, why aren't they dead?
FWIW, a gas mask alone will not protect one from nerve gas. Once it is aerosolized it can be absorbed right through one's skin. Even a microscopic aerosol droplet can kill you.
Even if the gas didn't kill Gleason and his men, they are about to be killed when the antimatter containment fails, and releases energy equivalent to a hydrogen bomb.
So, they didn't really have to worry that killing them would leave ripples in history.An early Michael Chrighton novel, entitled
Binary, was very educational about nerve gas. Our hero has to administer the antidote to nerve gas -- Atropine -- when he defuses the fiendishly clever Rube Goldberg terror bomb the fiendishly clever bad guy left behind.
Crighton was a smart guy, and a medical doctor, and he has his hero watch a foreign training film where a condemned man is killed by nerve gas, rather than the cyanide gas used in American lethal gas chambers. Crighton was specific and detailed about the onset of symptoms of nerve gas intoxication. In his training film the condemned man took more than a minute to die, and experienced revolting symptoms, like loss of control over his bowel and bladder, before the onset of fatal convulsions.
Back before the 1991 Gulf War, when Saddam Hussein's Iraq still possessed nerve gas weapons, it was standard procedure for a
"volunteer" to manually mix together the two binary components that react to form their nerve gas. That volunteer would be given a shot of Atropine; he'd pour the second chemical into the reservoir in a chemical munition -- turning it into nerve gas; seal it up; load it in a cannon, and fire it at the enemy before it leaked enough nerve gas to kill the rest of the crew of his battery.
American chemical weapons are safer for the artillery crew. The two precursor chemicals are each in sealed reservoirs, that burst when shell is fired. The spin imparted by the cannon barrel's rifling serves to mix the two precursor chemicals together; a relatively small bursting charge ruptures the reservoir, and aersolizes the gas, when it hits its target.
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