wlad's own flesh and blood and sdunek tried to poison wlad why would vitali try to poison his brother??
There's a VERY realistic possiblity that Sdunek had something to do with Wlad's passing out during the Brewster fight. He did afterall inexplicably switch the waterbottles. He had about 3 million reasons to do it. He had unchallenged access to the press credentials to get into his corner area unnoticed, and with DK in the house, there would be no reason to suspect him. However, Vitali would have no reason to partake in such a coup and would likely murder Sdunek with his bare hands if he found any positive evidence of such.
100 to 1 there was some criminal activity - poisoning - involved in that first Wlad-Brewster fight, but boxing - and the whole ****ing country - is so crooked that it was never even investigated!