Board Thread:Questions and Answers/@comment-4929778-20160415205315/@comment-26932251-20160512201313

Maybe Armin changed by the time of the narration.

I mean, he does change quite a lot over the course of the manga. Just look at Chapter 81, in his position most people would be losing it in the presence of something like the colossal titan and the armored titan but he still maintains the presence of mind to actually notice a detail like the fact that the colossal titan got a 'little skinnier' and what the implications of that fact are.