This entry concerns the soldier whose execution General Blue orders in Chapter 70, not Blue himself. The shooter is unidentified, so this is not counted as a direct killing by Blue.
The filter uses the world where the event occurred, not the character’s origin. Distinct future branches remain separate entries.
General Blue orders the soldier's execution. After the soldier is taken away, a gunshot is heard off-panel and Blue reacts. Blue gave the order, but the shooter is not identified, so this is not added to Blue's direct killing count.