Each step of a Journey is a Personas audience under the hood. The conditions 'stack' so a user has to be a member of the previous step (audience) and meet all the conditions of that current step to get added. Additionally, users cannot exit journeys once they have been added, but they can 'leave' a step (audience) if they no longer meet that step's conditions, even though they will still pass down to the next step. So, if the user no longer satisfies the entry condition will leave that step itself and user count will be reduced. And the user entered the next step will remains there until and unless the user fails for that step's condition and the count won't be reduced.
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