The Fergus Timeline is a game mode in Wolfenstein: The New Order and Wolfenstein II: The New Colossus, where the Player chooses to save Fergus Reid over Probst Wyatt III, in which the latter is left to be dissected by Deathshead.
Fergus Timeline
In New Colossus, not much changes, except that Fergus follows the same events that Wyatt would follow in his Timeline.
The changes are most visible during the events of The New Colossus, where Fergus loses an arm by the axe of Irene Engel (while Wyatt has part of his face cut off). He also acts more rudely towards Sigrun Engel, even though the latter saved them and allied with them. and also becomes enraged when the Robotic Arm begins to rebel against him. Fergus also develops a crush on Mary Sue, but the robotic arm ends up throwing the flower away and touching Mary Sue's breasts, infuriating her and slapping Fergus. After this incident, Fergus becomes enraged and removes his arm, slamming it against the wall several times. But at the end of the Game, in the Ausmerzer Chapter, we see him using the Mechanical Arm.