If you had a Bitfinex account and a Coinbase account, you couldve made some easy money. Coinbase went under $200 for a split second but Bitfinex stayed under $200 for 10 minutes, hitting $162.
The spread was huge for those 5 minutes

They require confirmations, wouldn't be possible to arbitrage.
You are right, because it wouldn't be possible for someone to already own bitcoin on coinbase and have fiat on bitfinex...
Maybe it's the government dumping seized Bitcoins to try and accelerate the panic that's already been developing.
Thanks for the cheap coins CIA!
You don't seriously believe this do you?