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Inversion:
He had rarely seen such a sunset.
Rarely had he seen such a sunset.
I lit the fuse and after a few seconds the rocket went up.
Up did the rocket go a few seconds after I lit the fuse.
Her father stood in the doorway.
In the doorway did his father stand.
(Reference:
Inversion refers to an irregular verb placement form:
Use of Question Form
In this case, the question form (auxiliary + subject + main verb) takesthe place of the standard positive sentence structure (i.e. He goes towork every day):
Examples
Not only do I enjoy classical music, but I also have a season ticket to the symphony.
Seldom has the boss been so upset!)