They were both in agreement that the price Draco was asking for the list was too high. Though he didn't know the identity of her source, Antonin wouldn't have supported her going to bed with any other man. Not that he was in the habit of doing so before, of course. He simply tried to ignore it when he suspected it was happening. Each of them believed that they could be proactive and try to discreetly inform anyone they might suspect to be on Rodolphus" radar to be careful. No doubt it seemed like an obvious concern to some of Antonin's closest supporters that they were in danger. The ones that they were concerned about were the ones that Rodolphus and his faction suspected that might not be accurate. Even though neither of the Dolohovs had anything remotely resembling a sparking clean record in the past, they didn't want to bring danger and destruction to innocent victims just because they were assumed to be working together. It wasn't fair and it could help their cause in the long run to bring some of them over to their side.