Horus vs. arrows

More flashes, like laser fire. Projectiles, moving so fast they were just lines of light, zipped down the colonnade, faster than Loken could track. Oltrentz dropped onto his knees with a heavy clang, transfixed by two flightless arrows that had cut clean through his Mark IV plate.
...
	Further shafts flashed by, Loken felt an impact. Kairus staggered as a sagittar's dart punched entirely through his torso and embedded itself in the wall behind him.
...
	An arrow had embedded itself in the Warmaster's left arm. Without wincing, he dragged it out, and watched his blood spatter on the flagstones at his feet. He walked to the fallen Astartes, bent down, and gathered up the man's bolter and sword.

Horus Rising pg. 400 and 406