It's not unusual for people, especially the younger soldiers, to be nervous around him. Erwin tries to project an air of steadiness, calm and relaxed. Even so, the subject is not the easiest - apparently moreso than he realized. The news of Jean's death catches him a little off guard. Surely Levi wouldn't have left out something like this if he thought it was an important factor, but perhaps even he hadn't realized the true depth of things. Unusual, but not impossible.

Erwin frowns, concerned, but not making a show of it.

"I'm afraid I haven't, no. Would you mind briefly telling me what happened?"