When I seen that 400K wall my first thought was that whoever put it there knew it would not be taken out. That in all likelihood, they hung it up there to try to spure some selling so some shares would fall to them on the bid.
I sincerely doubt anyone holds a 400K plus position without knowing what they bought and why. They would also know what such a position on the ASK does. That it is not the way to get rid of a large position on the ASK.
IMO they were a buyer not a seller.
I seen it as a good thing. It helped me add a few.