Yes, I can read between the lines, I can sometimes hear what you’re not saying with your words. I do it not to know by some private divination what your secrets are, but I do it in order to bring up and clarify together feelings or solutions which might not yet be fully present to your awareness. I reject interactions like, I know you meant such and such because your eyes moved such and such a way, and if you try to tell me differently I’ll know you are lying. I reject that because I believe all body language is open to interpretation, as are all words, too.
Noticing nonverbals involves noticing them out loud, talking about body language.