The shorters aren't the ones putting up 4 lines of 1m+ buy walls which kept the price relatively stable the last few weeks. During that time we have seen 10m+ volume days and LDA needed to sell 25m (not sure of exact number) shares with the agreement it can't be lower than a specific level. I think it isn't unreasonable to assume that LDA had the walls set up to stop the downward momentum and to allow them to clear their shares. If they are done now then there's no need to have walls set up on the buy side so now shorters are free to push it down. Just my take.