You have a great way with people, which will come in very handy today. Being tactful and diplomatic is going to help you ease tensions between two friends and help everyone in your group get along much better. But when you step in to help your people have a civil conversation, try not to control how they act. Give them free reign to work things out in the way that makes the most sense for them. Your way is probably not the one they'd choose, so don't force them to.