the_debt_of_time

this needed to be done man to man. He would trap him with a wand and then break every
bone in his body with his bare hands.
To his surprise, Peter turned on the spot and stared up at him, wand in hand but
held behind his back.
"How could you!?" Peter shouted, and Sirius snarled. "Lily and James. How could
you betray them to the Dark Lord?"
Sirius's eyes widened, realising what was happening. He moved to strike but, like
before, he had underestimated Wormtail, who was, surprisingly, faster on the draw.
Sirius had barely seen the wand, had scarcely seen the flash of light and brief glimpse
of blood coming from Peter's hand, had hardly noticed the curse Peter breathed. There
was fire and blood and broken chunks of gravel in the air, and Sirius was thrown backward
into a brick wall, the breath knocked out of him.
His sense of smell came back first, followed by sight. The explosion had temporarily
deafened him, but he could still hear muffled screams as he launched forward toward a
large crater in the centre of the street where he could see the outline of Peter's robes. Sirius
ignored the bodies of the Muggles strewn about, seeking only the prize he required before
it escaped his reach. He gripped Peter's blood-soaked robes tightly, noticing the severed
finger as it fell to the ground.
"Where is he?! Where's that fucking rat!?"
In fury and grief, his sanity finally shifted to the other side of the line, and Sirius
began laughing maniacally as he understood what had happened. He had been tricked. He
tore at the bloodied robes in his hands, roaring in rage, just barely aware that he was now
surrounded by a team of Aurors lead by Bartemius Crouch and Cornelius Fudge.
Images of Lily's and James's bodies came to the forefront of his mind as the smell
of blood continued to assault his senses. The laughing gave way to tears, and Sirius buried
his face in his hands, mournfully crying, "It's my fault. I killed them. I killed them."