Please see the example in the screenshot. The Hindi Wikipedia Abusefilter warns that the title of the translated article is not written in Devanagari script. However, the red vertical bar indicating the problematic section is displayed against the first paragraph that is being translated.
Heh. I was for some reason under the impression that the response from AbuseFilter includes the section where the failure was triggered, but now that I looked at the code, it looks like the section that is highlighted is simply the one that is being currently checked. It's possible that I'm misunderstanding something, however, and I'd love a clarification from @santhosh or @Nikerabbit.