1. They stack the ask, while sitting on the bid. 2. Then they sell into their own bid to induce others to sell into their bid. 3. Then they walk it down. More successfully on low volume.
The ask walls are fake and just for intimidation. The minute they start getting buying pressure they retreat the ask up up up because they don’t really want to sell those shares because they know it’s going higher.
The trick is to slap the ask and make them retreat. They can’t handle the pressure. Don’t be fooled!