Seeing their attacks so easily shattered by their opponent, Sirius Black and Moody both looked grim.
Sirius Black hesitated for a moment before raising his Wand at Greyback again and shouting sternly, "Avada Kedavra!"
Against Greyback, whose physical body was formidable and whose magical resistance was so high, even powerful spells and Dark Arts were clearly unable to achieve much.
The Killing Curse was different. Its instant-death effect did not care how high Greyback's magical resistance was.
Moreover, the Killing Curse's ability to ignore magical defenses meant that Greyback, unable to use Wandless Magic in his Werewolf form to control objects with the Levitation Charm and block the spell, could only evade the Killing Curse.
Greyback twisted aside to dodge the Killing Curse Sirius Black had cast. He had not expected members of the Order of the Phoenix, who prided themselves on being righteous, to use the Killing Curse against him!
In truth, Sirius Black would never have done such a thing in the past. But under Linley and Irina's influence, he had increasingly come to understand that in war, there were no right or wrong spells—only the most suitable spells!
Since the Killing Curse was particularly effective against a Werewolf like Greyback, Sirius Black naturally would not leave such a useful Killing Curse unused and instead scratch Greyback with ordinary spells.
Greyback wanted to counterattack Sirius Black, but Lupin, who was lunging at him like a mad dog without regard for his own safety and even trading injuries for injuries, left him no time to concern himself with Sirius Black and Moody in the distance.
Lupin was clearly no match for Greyback, yet his nearly suicidal fighting style made Greyback somewhat afraid.
If Greyback chose to press the attack, the Killing Curses coming from Sirius Black and Moody in