Warrior of Vengeance (復仇の戦士 Fukkyū no Senshi?) is the 2nd chapter of the 11th volume and the 38th chapter overall of the Attack on Titan: Before the Fall manga, written by Ryō Suzukaze and illustrated by Satoshi Shiki.
Angel is horrified at seeing Corina devoured in front of him. Putting on his device and taking Xenophon's dagger, he leads Mammon outside the Wall in order to try and kill it. He is unable to and is forced to retreat, swearing to kill it someday.
Angel stares in disbelief at the sight of Corina being crushed and subsequently eaten by the Titan Mammon. Seeing her head fall to the ground, Angel screams in rage and despair. Muttering the word "kill" over and over, Angel grabs Xenophon's iron bamboo dagger and starts to slice Mammon's ankle. Xenophon notes with surprise that it caused damage where no other weapon could before, but Angel ignores him. Eventually, Mammon notices Angel slicing him repeatedly and peers down. Angel leads Mammon away and hides in a building while putting on his device. Riding down the street, he gets Mammon's attention once more and rides toward the gate, yelling for everyone to get out of the way. During the confusion, Maria calls out to Angel as he rides past.
Once outside the Wall, Angel sees Mammon approaching him and sends the horse away. Firing the hook of his device, Angel flies up past Mammon's head and angles himself to strike. However, he runs out of gas and is stuck just beyond Mammon's grasp. Angel looks in horror as he spots the coiled wires starting to rip and tear; fortunately, Maria sends down a rope and yells for Angel to grab it. As he is carried away, Angel glares down at the smiling Mammon and, swearing vengeance, declares that he will kill it to avenge Corina.