[incomplete, but still before Erwin's lost his arm. Levi strengthens his mask so as not to arouse more of Erwin's suspicions. There's no need to inform him of that particular detail, especially when he knows that what Erwin's really concerned about are the results of the mission itself. Knowing that he'll lose his entire right arm would be superfluous to what they have to focus on now.]
...You completed the mission. Eren was successfully retrieved, but the others got away.
[which may or may not have been the case had he been there, like how Erwin may or may not had to have lost his arm.]
no subject
...You completed the mission. Eren was successfully retrieved, but the others got away.
[which may or may not have been the case had he been there, like how Erwin may or may not had to have lost his arm.]