Ask yourself if you can restate what they're saying or pay attention to what they're physically doing to gain a concrete, object level sense of what they mean.

I doubt that a beginner without much body awareness who goes into that dojo would be able to notice the difference between what the sensei is saying and what he's doing. If it would be easy to see, someone would have already told him. Val spend a lot of time developing awareness and is using it in that example.