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Vast Silhouette's Fetters (巨影の枷鎖 Kyoei no Kasa?) is the 3rd chapter of the 14th volume and the 51st chapter overall of the Attack on Titan: Before the Fall manga, written by Ryō Suzukaze and illustrated by Satoshi Shiki.
The remaining trainees are shown the vertical maneuvering equipment and are introduced to Angel and Sharle, the designers of it. The three trainees in the primary group practice using it and are surprised by how fast it is; later that night, Rosa continues to question herself as to the real reason why she wants to join the Survey Corps.
As the remaining trainees assemble, Kai wonders aloud what lesson they will be getting today. Just then, Carlo, Angel and Sharle arrive and are followed by Kuklo and Cardina carrying several cases. Rosa looks up and recognizes her as the girl who arrived a few days earlier (and who was mentioned by Kuklo as he was recovering.) Carlo introduces Angel and Sharle as the creators of the vertical maneuvering equipment, surprising all the trainees. He then calls on Rosa and informs her that, as the only female applicant, she will be sharing her room with Sharle. Then turning to Ivo, Hugo and Kurz, Carlo has them come forward and get suited up with the equipment. He reminds the three that they need to memorize the steps for they will be doing it on their own next time. The other trainees are told that another aptitude test will be taking place the following day and the seven who pass will immediately be given equipment as well.
At the forest nearby, Carlo informs the trainees that they will be practicing with the equipment. After Kuklo demonstrates, Kurz volunteers to go first. He anchors himself successfully but is caught by surprise by the speed and is stuck upside down. Hugo goes next and misses a tree, causing himself to get dragged across the ground. Finally, Ivo anchors to a tree and is able to land on a branch but is unable to remove the anchor and falls to the ground unconscious. Although surprised by the amount of skill required, Kai remains determined to pass and experiment with the gear himself. Later that night, Rosa lies on her bed and inwardly asks herself the reason she wants to join the Corps. As she claims she wants to fight alongside her friends and Kuklo, Rosa visualizes the Titan that grinned at her; this causes her to shake and shiver uncontrollably.