Found this video the other day. Excellent slow motion of hand at release around 1:00.
<iframe width="560" height="315" src="https://www.youtube.com/embed/z7cvcqe-bbQ" frameborder="0" allowfullscreen></iframe>
<iframe width="560" height="315" src="https://www.youtube.com/embed/z7cvcqe-bbQ" frameborder="0" allowfullscreen></iframe>