The English loses a bit of context.
It's not えーーー!? (Ehhh!?) In the "Huhhh!?" sense. It's エっっっ!in the sense that the Hero is cutting himself off from saying エッチ or エロ (ecchi or ero)
The belly is your issue with her armor? Not that it is tied on with a string by the sides, such that it leaves the kidneys etc. entirely exposed to stabs?