Suck that bottle empty and record the time.
I gotta be honest, I don't miss this drill one bit. Guys in their 20s love it. People in their 30s are okay with it. 40+ firefighters are annoyed by it and guys over 50 hate it. The one guy left on the job who is in his 60's probably loves it, he is not normal.
This drill is part of our mandated respiratory protection program, which also includes class time and a physical. It also shows who the animals are.
I must say, it is a lot more fun shooting it than it is to participate in it.
Thanks for reading,