Good interview.

I would be curious to know what he is looking for when assessing each side​ of the order book. He mentioned​ it very briefly but didn't go​ into any specific details as to whether​ it has anything to do with what I, as a newb, instinctively​ think could be buy orders' volume versus sell orders' volume maybe hinting at which way the market could go next, or if it is something else entirely.