It is very strange that he will question every down movement but will ignore all up movement. He questioned it yesterday why Intel is down. He is questioning it now why it is down in AH markets. But ignored what was happening all day.
Can,t speak for "dark pool" traders, but i knew a trader, Dr. Zeev, who placed what he called Outrageous Bids, limit orders placed before the open to take advantage of the volatile openings. not totally unusual for the low of the day to happen in the first few minutes.