I have seen a lot of those recently on BAS/ETH in HitBTC, but they were on both sides. I have also seen what appears to be a person trying to block movement up and sometimes down by placing an obscenely large order (about 10 to 30 times the other large orders). It has the effect of causing people to not even get close to those orders and when people get used to them being there, or if someone actually does start nibbling on them, they move further away from the current position or are taken out completely. If one disappears, it tends to cause movement in that direction, but I have also seen them cycle in and out. I suspect a rookie market maker or something. Have you seen this? If so what do you make of it? the bottom one just dissipated on BAS.