The short version
Hand on the handle, or on the wheel with the car parked and the engine off: one long exhale, Trap Door optional, the day’s weather left on the threshold. Works on an empty house.
What the research says
Craft. The most-used tool in Part Two, because every room has a door out.
Rooms where it does the work
Two rules, no exceptions
Never practice any technique on this site while you are driving, operating machinery, or doing anything that needs your full attention. The slow ones can make you drowsy, faster than you’d expect. And never practice a breath-hold, bellows breath, or any vigorous breathing in or near water. Read Before you begin for the doctor’s list and the rest.
The short version is a reminder, not a lesson. The chapter has the story, the steps, the mistakes, and the limits.