Let's discuss that bizarre story BM told to LE about SM mixing chemicals while she was cleaning the shower.
This from google: "Both chloramine and chlorine gases are immediately irritating with a very pungent odor, causing watering of the eyes, runny nose and coughing. ... Close the door to the room and stay out of the area until the smell has dissipated."
Running a google search on "how to neutralize chlorine gas" leads to the following answers by chemists on Quora
1) I’d suggest getting the fumes out of the air by taking advantage of chlorine’s high solubility in water.
2) Dry it up as quickly as you can. Throw a towel on it, dry it up quickly, put the towel in a bag and tie the bag shut or toss it outside until the reaction stops
Edit: More info via Quora from four years ago. Question is "what should I do if I accidentally breathe in a little chlorine gas?"
The great thing about chlorine is that you know very quickly if you have been harmed. It is not one of those substances that give you cancer 20 years later or makes you die of liver or kidney failure in 6 months. If you can just smell it (4–5 ppm) you are likely to get some respiratory effects in about an hour if you stick around. Much higher than this and you will automatically go away. Get fresh air. Tell someone what happened (in case you are not able to later). Changing your clothes (to remove any gas absorbed in them, air them well), having a tepid shower and rinsing your eyes is likely to help. If you feel bad, and particularly if you feel worse, get medical help.
I have often breathed small amounts around swimming pools. Nothing to worry about, but if it stings my eyes, I go away.
Edit edit: BM would undoubtedly have breathing equipment to avoid getting too sick from fumes due to his being a firefighter.