In my experience as a product manager, I have found that the key to turning an adversary into a confidant is through open and honest communication. When faced with an adversary, it can be tempting to become defensive or dismissive. However, I have found that taking the time to listen to their concerns and addressing them directly can help to build trust and understanding. One approach that has worked well for me is to schedule a one-on-one meeting with the adversary. During this meeting, I aim to listen more than I speak, and to truly understand their perspective. I ask questions to clarify their concerns and make sure I am addressing the root of the issue, rather than just the surface-level problem. Once I have a clear understanding of their concerns, I work to find common ground. I try to identify areas where we agree and build on those, rather than focusing on our differences. I also make sure to communicate my own perspective clearly and respectfully. In some cases, it may be necessary to involve a neutral third party to help facilitate the conversation and ensure that both parties feel heard and understood. This can be particularly helpful if there is a significant power dynamic at play. Overall, I have found that approaching adversaries with empathy and a willingness to listen can go a long way in building trust and turning them into confidants. It requires patience and effort, but I believe it is worth it in the long run.