Once that buy order was filled, the remaining bid/ask prices remained the same. That would happen every time unless it cleared off the sell wall, or there was a bid above 808
No.
I was sitting watching this as it happened. For a big like that to go through on the exchange in the normal manner, it would either have to bite a big chunk away from the Bid or Ask walls. This didn't. It was as though a large buyer and seller magically approached the market at the same time and met each others demands to the tune of 800 BTC. Bid/Ask depth remained constant throughout.
Yet more fishy dodgy shite from exchanges that I really have trouble feeling that I can trust.
Are you logged into bitstamp and bitcoinwisdom at the same time, or just bitcoinwisdom? If you look at the prices on bitcoinwisdom, the prices are sometimes different than on the exchange itself. Coinbase is like this frequently. Bitcoinwisdom will say that the price at coinbase is a certain dollar amount, but then if you are logged into coinbase, then the price is different.