Body language of tapping feet: Reading body language may take you plenty of places and while learning how to interpret nonverbal communication every motion of the body may mean something.
Leaning A frame hug is similar to the full A frame hug but done from the side as a half hug.
The body language or non verbal cues come from the proximity or distance apart that the people are when giving a full hug.
The two people in question are comfortable enough to not just touch shoulders but embrace and allow the rest of their bodies touch.
There are times where people have nervous reactions to a situation and they do not have control of what their body does.
Nervousness can usually start with the hands shaking or even the feet or a foot tapping.