The female Titan kills the two scouts and heads after Armin. The female Titan attacks Armin and removes his hood before leaving him. Armin works out in his head that the Titan is a human like Eren, and can transform.
Reiner finds Armin and has a spare horse for him. Jean soon joins Armin and Reiner, and Armin explains that the female Titan is a human, like Eren, and she is after Eren. The three of them decide they need to slow her down at best and go after her.
The female Titan nearly kills Reiner and Jean but Armin tricks her into thinking that Eren died among the right wing spotters she laid waste to earlier.
After the opening credits of episode 18, Jean is found calling for a horse and Reiner is bandaging Armin's head after the previous attack on the femaele Titan. Armin tells Jean and Reiner that they need to send an emergency signal out, as there should be someone near by that can help.
Christa soon appears with two spare horses, one being Jean's original horse. After mounting and heading off, the group head towards the remainder of the regiment, where the female Titan is making her way towards the centre.
The regiment soon approaches a large forset, where the commander tells the troops that only the centre rank wagons are to enter, and the rest are to go around. The troops are then told to stop and to stand guard in the trees and stop any Titans that try and enter.
Inside the forest, Eren questions the group as to why they are in the forest. The female Titan soon finds Eren and the group ask Levi what to do. Levi tells them to carry on and then to cover their ears before he lets off a flare.
The flare Levi let off at the end of episode 18 was an acoustic round, which slows the female Titan down slightly, due to enhanced hearing. Levi then reminds the squad as to why they are there, to keep Eren alive. With troops being killed continuously behind him, Eren decides transform to his Titan form, but the rest of the group try to persuade him not to.
Eren has a flash-back to before, in the castle, where Levi tells Eren how they could save him if he turns evil when he transforms. They decide to see what will happen when Eren does transform and put him at the bottom of a well.
Eren tries to transform but cant and is left with multiple bite marks on his hands.
Sitting around a table with the rest of the group, Eren is drinking tea when he drops his spoon. He reaches for it, upon which, Eren suddenly grows a Titan arm, causing a massive explosion of smoke. When the smoke clears, Eren is surrounded by the others with there swords drawn, pointing towards him.
They begin to shout at Eren, his hand grasping the arm of a part Titan. Zoë shows up, screaming and shouting in joy and touches the arm, Eren decides to detach from the arm and pulls free, causing the arm to begin to vaporise.
Back at the castle Eren and Levi join the rest of the group in a room, where Zoë explains that Eren might need a clear objective to transform. The group ask Eren if he meant to transform which he tells them he didnt, so the four of them bite there hands as Eren dose, when he wants to transform.
Returning to the forest, the group ask Eren to trust them, which he decides to do. Not long after this, the group run through a trap that had been set up ahead for the female Titan, which she gets caught in.