During the closing matchup, an order for 1,000,000 was set at...

During the closing matchup, an order for 1,000,000 was set at 1.07. Very quickly a matching order for 1,000,000 came in at 1.02.

I thought this was just some mucking around and the orders would be pulled. Instead the orders were filled.

04:10:31 PM 1.050 10,000 10,500.00
04:10:31 PM 1.050 11,458 12,030.90
04:10:31 PM 1.050 1,654 1,736.70
04:10:31 PM 1.050 5,591 5,870.55
04:10:31 PM 1.050 10,000 10,500.00
04:10:31 PM 1.050 4,409 4,629.45
04:10:31 PM 1.050 980,000 1,029,000.00
04:10:31 PM 1.050 20,000 21,000.00

More than half the daily trade went through in the close.