GR Translation: she has lost her surface

[Mike Jing]

V545.30-38  She only raises her eyebrows. It was a shitty thing to say.
Remorse, or some late desire to be pure, rush into his blood like dope.
       “But—” astonished to feel himself beginning to collapse, like a
stack of rifles, around her feet, caught in her gravitation, distances
abolished, waveforms unmeasurable, “Katje . . . if I could never betray
you—”
       He has fallen: she has lost her surface. She is staring at him amazed
       “Even if the price for that were . . . betraying others, hurting . .
. or killing others—then it wouldn’t matter who, or how many, no, not if I
could be your safety, Katje, your perfect—”

What does "she has lost her surface" mean?
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