Paulo Costa responds to Bogdan Guskov's callout

Paulo Costa has responded to a callout from Bogdan Guskov. The brief post does not provide details on the nature of Costa's response or whether he accepted or declined the challenge. This appears to be an ongoing social media exchange between the two middleweights. Additional context about the exchange would require access to Costa's actual statement. The post suggests continued tension or interest in a potential matchup between the Brazilian veteran and the rising contender.