It’s 1 am. You walk past any other alley, but the reflection of a knife catches your eye. There’s a fight. One is on the ground, battered and breathing heavily, holding a knife to the other’s throat; his glare so strong it could kill. The man on top of him points the barrel of the gun to his forehead, equally bruised but keeping the other firmly down. They both seem fully immersed in their fight and don’t notice you.

(you choose if childe needs help or is the one attacking :D)