Yes he was sparked out by a single punch that can happen to any fighter, but the signs were there just before it happened.
Sprott's tactics were perfect (apart the flash knockdown); keeping his hands up & attacking Audley up close & roughing him up.
Harrison is the archetypal bully, very good when his opponents are weak, but does not like it when the going gets tough.
He was beginning to wilt just before he was KO'd.
His stamina remains well below par & his fighting heart is practically non-existent!
I have to apologise profusely to Mr Sprott for actually believing that someone as average as Audley Harrison would knock him out.
Audley just needs to go & hide away in Las Vegas & spend all that money he has conned out of fight fans over the years.
He will not be missed by me, one iota.