The memories turned darker as he neared Knockturn Alley, because that was where the danger came from, that was where people stopped going out at night when the war had been at its height. That was where Sirius would vanish for hours at a time, and come back without his brother, looking like he wanted to kill something. That was where James had pulled them, the first time they went out Death Eater hunting, the only time they'd brought Peter.