The other FO sim betrays everyone at the final hour (either just before defeating Mother plant, or right after when the mission is over and they're about to go their separate ways). Amos is left to choose between his commitment to the Order and side with his rival officer, or stand by Willow even after she has experimented on him. The other officer would know that Willow is a weak spot for Amos, and he'd have to destroy her to show his commitment to the Order and maintain his rank. Amos first chooses against his rival, but that positions him with the Resistance again. If he's injured during the altercation, then Willow can nurse him back to health and they can rebuild their relationship.
