When a statement sounds like a question

The voice falls at the end of this statement, if that's what you're asking.

Are you suggesting that this is equivalent to "Wasn't it John who painted the wall?"

I don't think so, but I believe I understand your point. They're both a form of objection, or protest.

I think its two questions worded the same first " asking if John is the one who painted the wall " second "asking if the wall was painted by john" {I think}