Alternate Vessel of Castiel - Harry Potter
Harry Potter
Castiel waited for the abomination to leave before he came. The human was dying but still staying conscious.
The angel explained his mission and the human told him his last wish. Castiel didn't need time to decide, he wanted to destroy the abomination anyway, leaving the human aware in his mind for this wouldn't be a problem.
The image of Severus Snape covered in blood, going through the fight impervious to curses and hexes, just holding his hand to Voldemort's head to destroy him before Snape vanished into thin air was not something the survivors of the battle ever forgot.
Another drabble for this series. For the other chapters see LJ or AO3.