Maybe that's why he was gone for a month? He must have been spying on him if he found out he had a kid to look after. Gregorio did have the gears turning in his head, though his paranoia could just have been getting the best of him. "Nothing." he muttered rather defensively. It looked like he was thinking about punching the other man as a warning shot if he got the idea of getting too close to him? He wasn't really thinking at the moment before punching Katsuro in the jaw, the redhead was clearly let his paranoia get the best of him. It was also why the family didn't let him handle the serious jobs and left him to be the 'trashman'.