http://www.mirror.co.uk/sport/more-sport/boxing/2010/11/04/david-haye-dismisses-audley-harrison-s-claims-that-he-was-floored-in-sparring-115875-22692108/
Seems to have taken him a while to respond to the claim, which probably means it was never true
He responded two days ago on sky sports (they got a whole forum for the fight, promoting it very well), tony also responded saying he ddi not knock Haye down
This fight is not going to last more than 5 rounds, while the klits would take 12 rounds to finish a bumb like Harrison, Haye has the speed, stamina and power to take him out in at least half that time