Paulo Costa responds to Bogdan Guskov callout

Paulo Costa has responded to a callout from Bogdan Guskov. The post indicates that Costa replied to Guskov's challenge via social media, though the specific content of Costa's response is not detailed. This appears to be a developing social media exchange between the two middleweights, potentially setting up a future matchup. Without the actual text of Costa's response, the nature of his reply—whether accepting, dismissing, or counter-challenging—remains unclear from this brief announcement.