Mikasa and the rest of Levi's squad arrive just in time to save Eren and Historia from a transformed Rod. Mikasa and the rest of Levi's squad, with the exception of Armin and Hange, continue their pursuit of the First Interior Squad but are suddenly stopped by a bright flash and rest against some pillars.
Fuddy-duddy (or fuddy duddy or fuddy-dud) is a word used to refer to a person who is fussy while old-fashioned, traditionalist, conformist, or conservative, sometimes almost to the point of eccentricity or geekiness.
If any term sounds old and English, it must be this one. As so often, intuition is found to be inadequate as fuddy-duddy appears to be of American origin, possibly via Scotland, nor is it especially old. The first record that I can find of it is from the Texas newspaper The Galveston Daily News, 1889: Look here; I'm Smith - Hamilton Smith.