Different languages are precise and vague in different domains.

For example English requires articles. You can have a book or the book. You cannot just have book. In my native language we don't have articles. If I want to specify it's "a" book I can (with the word to the effect of "some"), if I want to specify it's "the" book I can (with the equivalent of "this" or "that"). But by default we don't care.

On the other hand every verb encodes gender in my language. So when author wrote in English "Somebody in the audience said >I was with you<" - the translator has to guess what was the gender of that person. Because "was" is a different word depending on the gender of that person :)

EDIT: I'm -> I was, because in present tense verbs can be the same :)