the_debt_of_time

Using the horrifying sight as a diversion, Sirius shouted, "Petrificus Totalus!" at his
opponent, who froze up immediately and fell over. Leaving the Death Eater, he rushed to
where he saw Moody crumpled on the floor, bleeding from his head.
"Get up, old man," he mumbled, running his wand over the wound on Moody's
head—a simple enough Healing Spell that would at least get him out of this place alive. He
was not good enough at Healing Charms to fix it permanently.
With Moody handled, Sirius turned back to look for Harry and growled at the sight
of Antonin Dolohov stalking toward his godson.
The Death Eater raised his wand just as Sirius charged, and Harry threw up a
Protego. Sirius rammed the Death Eater with his shoulder, sending him flying out of
Harry's path and unfortunately into his own.
"Black!" Dolohov roared when he regained his footing.
"This is for my father!" Sirius snarled and raised his wand, shouting every curse—
legal or not—at the Death Eater responsible for Charlus's death, responsible for killing the
Prewetts, responsible for Hermione's current state.
Dolohov was quick and dodged Sirius's attacks, only occasionally taking a hit to the
arm here and there, which somehow did not even throw the man off balance. Not like it
did when Dolohov hit Sirius in the shoulder with a Slicing Hex.
Springing up, Harry yelled, "Petrificus Totalus!"
Dolohov's arms and legs snapped together and he keeled over backward, landing
with a crash on his back.
Sirius grinned at his godson. "Nice one!" he shouted and jumped up, forcing Harry's
head down as a pair of Stunning Spells flew toward them. "Now, I want you to get out
of―"
They both ducked again when a jet of green light sailed toward Sirius, narrowly
missing him. Across the room, Sirius saw Tonks fall from halfway up the stone steps, her
limp form toppling from stone seat to stone seat, and Bellatrix, triumphant, running back
toward the fray.
Sirius's eyes widened and he turned to search for Remus, who was barrelling down
upon a pair of Death Eaters twenty feet from where Tonks was, unaware that Bellatrix had
turned her eyes on him. Sirius turned back to Harry in a panic. "Take the prophecy, grab
Neville, and run!"