There you go ;-).

Maybe someone wanted to hold the SP down and wasn't expecting the ask to be taken at once. Why would you try to sell such a big block and hold the price down, when you really want to sell for the best price. In this case you wouldn't put 400k shares pre-split into the ask. 

You would allow the price to increase and sell in small chunks for the best price possible. 
Anyway, wall is gone for now.

Thanks to the one who took it out though.