That’s what we could have done differently.
“Witnessed arrest” is something you never get used to.
You can move quicker out the door, they could have called sooner, but when you get that gut feeling that the final moments have already started all you can do is anticipate the next 5-10 minutes.
All the while hoping the watching family understands why their loved one was alive when you got there and not when you left.
Then explaining to the ER docs that they were indeed conscious and talking in between the 40 breaths a minute, then lost visual focus and you watched the monitor go from 130 to 40, then to nothing. Nothing at all.
Between the responders caring for this imaginary person there were over 70 years of ALS experience and duplicate state of the art tools and medications, procedures and techniques.
It happens, only when you least expect it. So expect it. It makes it easier to explain to the BLS members why your salary, fancy education and expensive equipment was useless to intervene in time.