No-one wants to take the lead with things like this – they seem to not see it.
We have a provisional coded warning in our building, one designed to get the attention of the right staff without upsetting nor alarming the public. That then becomes the full alarm if needed. A member of staff was on the phone to a customer as this happened and was trying to explain that he needed to hang up but the customer kept going on so he stayed talking on the phone!
We were like “just **** hang up!”. He said afterwards he didn’t want to be rude!
The chemical labs I used to work at were really quite good, there was a definite procedure (turn off all heat sources and all chemical additions, leave on all coolant flow and stirrers) and it was well practiced, lead by good experienced members of staff and no-one there was daft enough to stay in a building packed with chemicals and solvents!