The Son of Horus halted and swiped at the flames where they licked over the ceramite, patting them out with the flat of his gauntlet. As Koyne watched, the Astartes was still dotted with little patches of orange flame as he pivoted on his heel and aimed upward.
A heavy thunderclap shot rang out, and the bolter blew a divot of brick from the third floor. A body, trailing threads of blood, came spiraling out with it, killed instantly by the proximity of the impact.

Nemesis pg. 620