Sw3
Didn't explain myself well.
I don't think that could have happened - even if he did accidentally type in 5.8 - because there would have been buyers in the queue at say 8.4, 8.3, 8.2 etc etc and they would have automatically picked up his 2 million share sell order at some average price above the 5.8.
Difficult to explain but perhaps someone can do better.