GR translation: except now as an erotic category

[Mike Jing]

V758.24-32, P773.32-40   Two lights wink out. “Stecker 1 und 2 gefallen,”
Moritz reports. The Stotz plugs lie blasted on the ground, tossing in the
splash of flame. On gravity feed, the flame is bright yellow. Then the
turbine begins to roar. The flame suddenly turns blue. The sound of it
grows to full cry. The Rocket stays a moment longer on the steel table,
then slowly, trembling, furiously muscular, it begins to rise. Four seconds
later it begins to pitch over. But the flame is too bright for anyone to
see Gottfried inside, except now as an erotic category, hallucinated out of
that blue violence, for purposes of self-arousal.

In what sense is the word "category" used here?
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