Yes, but still normally this mistake would be unwound. The recipients would just send the money back, or a court would tell them to send it back, even though th

Yes, but still normally this mistake would be unwound. The recipients would just send the money back, or a court would tell them to send it back, even though the money was owed. But there were a number of confounding factors - for example that the money wasn't owed by Citi - it was owed by someone else and Citi was just paying on their behalf.