The way I understand h&s is that we should see an increase in volume when declining from the right shoulder. That would be a warning sign this is a legitimate h&s.

In @haejin's latest video he said the volume was not indicitive of a h&s, but according to http://stockcharts.com/school/doku.php?id=chart_school:chart_analysis:chart_patterns:head_and_shoulders_top_reversal it's exactly what you should expect.

Again, @haejin has way more experience than I do, so sometimes "intuition" plays a role in TA. He's been quite good with that in the past.