Maybe he just told you he has 10x the amount of shares he actually has. I was watching exactly then because I had just loaded some 4's seconds before that 5 buy hit. It was 140k not 1.4 M.
It was the only hit on the five and five held with no buys or sells for a while. The bid built on 4's for 5 or 10 minutes til it was at about 25 Million.
We all know what happened next. BMIC whacked the 25 M sitting on the 4's and then was the only MM at 4 on the ask for a while.
It was right at that time when we could have gone 4/5, and instead we got a Ttrade