If you go down from a legit bodyshot you don't just get up and continue fighting, as Brodie showed the other night. Hatton went down to draw attention of the ref to say it was low-ish.
it was about as long as you can get unless Kostya tucks it in his sock
though it was tit for tat, Kostya smacked him south once before and agian just beofre hatton retaliated though Hattons shot was pre meditatd and totally intentional, as in "thats twice now Mr Zoo have one back".