Someone

Somebody is the 48th chapter of Shingeki no Kyojin manga written and illustrated by Hajime Isayama.

Summary
The pursuit of Eren's kidnappers continues. Erwin, upon seeing Titans reaching them, orders everyone to let the Titans follow them. A soldier of Military Police accuses him of using them as a decoy again, however, Erwin states that it's not his intention and tells them to fulfill their duty as saving Eren is extremely important. Meanwhile, others also keep chasing Eren and others. Armin makes a hypothesis, saying that if Reiner were to remove the armor from his joint areas, he'd run faster. With determined expression, Mikasa states that this time, she will kill Reiner and Bertholdt without hesitation, along with Ymir if she gets in the way.

At that time, Christa is released from Ymir's mouth. Ymir apologizes, but Christa questions her intentions, saying that they had come to save her and Eren. Ymir opposes this and states that she's coming with Reiner and Bertholdt, telling Christa to come as well as there's no future inside the walls. Christa mentions Titans, but Ymir states that they aren't so bad, much to Christa's surprise. She states that she doesn't understand Ymir's actions at all and wonders if she's being threatened by Reiner and Bertholdt. The latter says that it's the opposite. Christa begs Ymir to release her, saying that they can fight together. Bertolt notices that the soldiers are catching up and blames Ymir for delaying them by kidnapping Christa. He questions Ymir, asking if she's going to leave Christa inside the walls again for her own sake, but Ymir reveals the truth, saying that she took Christa in order to save herself. She explains that her Titan powers were stolen from comrades of Reiner and Bertolt and states that with their immense power, she may get killed, but with Christa cooperating, that may not happen. Ymir further reveals her feelings, stating that she's afraid of dying and begs Christa to help her. Christa tells her that no matter what, she's on her side.

At that moment, Eren awakens just as the soldiers catch up. Hannes attacks, but gets countered by Ymir. Without hesitation, Mikasa strikes Ymir, while Bertholdt, in fear, begs Reiner to protect them. Seeing Armored Titan's hardened defense, Mikasa decides to strike Ymir down first, but Christa attempts to defend her. Mikasa, however, states that she will kill Ymir only if she gets in her way.

Jean, Connie and Armin catch up as well just as Bertolt tries to subdue Eren. Jean states that knowing Eren, it's impossible, while Connie questions if everything was lie. However, Mikasa claims that there's no need to know that and calls Reiner and Bertolt a plague upon mankind. Hearing this, Bertolt yells out, asking who wants to kill people and says that even though they cannot be forgiven, they did what was natural and further claims that their time as soldiers was indeed enjoyable, despite other lies. Mikasa demands that Bertolt gives Eren back to her at once, but he refuses, claiming that he and Reiner need him for a reason. Bertolt then says that someone will have to stain their hands with blood in order to get Eren back just as Hannes yells at everyone to get away. From the direction where Reiner and others were heading, Erwin is running while being chased by a huge group of Titans.