as soon as one realizes ..., then ~
Expresses that as soon as the speaker perceives or realizes something, a subsequent action or situation occurs.
This pattern is used to describe a situation where, upon observing some fact or change, someone reacts immediately or the situation unfolds in a certain way. The nuance is that the realization is the direct trigger for what follows. It often implies a somewhat objective or third-person observation, rather than a personal feeling, and can sound analytical or literary. It is not used for habitual actions or general truths; it is for specific, often sudden, observations.