Seriously, who is the idiot selling large amounts of coins at 12k (mostly bought already), 13k, and 15k when demand is obviously very high and the price wants to go up? I'd assume he was trying to suppress the price to accumulate if it weren't for the fact he's losing his coins for cheap. How can you have that much money when you're that bad at trading?
It is actually a good thing if the 13k and 15k walls are bought by lots of people. Holding such large amounts of coins by a single person is never a good thing. So be patient. They will get eaten when the time is ripe.