Correction, he claimed he was unable to continue. I still to this day believe that Okami just used that as an easy way to secure the win without having any more risk.
I'm not so sure about that myself Okami did look pretty rattled by it and continuing may have been risky against a striker like Silva. Also don't think he was doing that badly at that point not necessarily winning. He did have Silva down where he wanted him and at that point had not been in any real danger.