Arms block punch dagger

From the corner of his vision, Jensen saw a hazy orange shimmer as light
warped and bent around an invisible form. He spun as the cloak of twisted
radiance fell away from the helmeted figure in black, getting a momentary
glimpse of four magenta-hued lowlight lenses set in a featureless blank
mask.

The thermoptical camouflage dissipated and the figure threw itself at
Jensen, a bright dagger snapping into place across the knuckles of their
hand like a switchblade. Acting on pure reflex, he brought up his arms to
block the stabbing motion and turn it aside. Artificial arms clashed with a
dull clatter of polycarbonate and Jensen’s hand jerked. He let off a shot into
the ceiling, the report of the pistol lost in the noise of the train as it
thundered through a tunnel.

- Deus Ex: Black Light, Chapter 11 pg. 205