Entry tags:
fanfic rec
A good little story set in the Sapphire and Steel universe, written for some of the other elements. https://archiveofourown.org/works/42395823
I liked it, and it manages the atmosphere very well.
Might possibly work for those not familiar with the series.

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The series doesn't really deal with aliens. Nor does it go into precise details of how supernatural things work - it's sort of wibbly wobbly timey wimey. Time is fluid and things can leak from one time to another if not taken care of.
I think you hit it on the nose with the experience that locked onto the doors and the murder reflecting down time.
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