Step 0 is the really high-yield tip here because it applies in so many emergencies. The natural shout of "someone call 911" is so often less effective: even if

Step 0 is the really high-yield tip here because it applies in so many emergencies. The natural shout of "someone call 911" is so often less effective: even if folks aren't halted by outright shock or confusion, their disorganization and/or assumption that somebody else will do it introduces miscommunications and delay. Nearly everyone takes to direct, simple instructions much better and faster.