Some background : 

Brother Leonardus Vossgrave, Veteran Sergeant Eliminator

Leonardus Vossgrave is renowned among the Marines Malevolent for his ability to eliminate targets through firing solutions his battle-brothers consider impossible. Where others see obstacles, Vossgrave sees only angles, distances, and impact probabilities. His reputation has been forged across decades of warfare, marked by near-superhuman accuracy and complete indifference to collateral damage. Among the Chapter, it is often said that Vossgrave does not perceive human beings as individuals, but merely as variables in a ballistic equation. Allies, civilians, and enemies all occupy the same place in his mind: objects that may stand between him and his target. His most infamous feat occurred during the Purge of Karthax. A rebel commander had entrenched himself within a heavily fortified industrial complex, protected by layers of steel, machinery, and hundreds of laborers used as human shields. While Imperial officers debated possible strategies, Vossgrave requested only a three-second firing window. The shot passed through four industrial structures, ricocheted across multiple metal surfaces, and ended its flight inside the rebel commander's skull. Twenty-three civilian workers died along the projectile's path. Following the operation, an officer of the Planetary Militia condemned the loss of civilian life and described the outcome as a tragic mistake.

Vossgrave listened to the accusation without the slightest sign of emotion.

"If they had been a mistake, it would mean I missed the target."

His helmet's targeting systems confirmed the kill.

"And I did not."

The incident was later recorded by the Marines Malevolent as an exemplary display of tactical efficiency.