Well I think because we are all human moods and circumstances can affect relationships. I can see he is not trying to ban edvard and hopefully he is forgetting it with time. I know edvard is not trying to lump the divided couple together he just thought there might be influence. I can say from experience sometimes accusations are more to see how the person reacts to the claim before there is any definite conclusions. It is up to turncoat to argue his side if he cares so much about how people see him.
Arguing does not have to be fighting. It means trying to persuade people to an level of greater knowledge. In most cases it should not be taken to heart. In arguments for me it is not about who wins or loses. It is about what knowledge I can gain. I am either able to strengthen and develop my ideas or I learn from the other side of the argument. The things is the argument should be divided from the person.
Turncoat you want to be divided from crow. In his eyes it is not fair to be lumped with someone. Edvard wants to be divided from his arguments. In his eyes it is not fair to be lumped with an idea mentioned.
The best manipulators know that you will never persuade anyone without knowing the goals, objectives, dreams and desires, etc of the other side. No one shares your goals, your dreams and if you want someone to act on your terms then you must align your goals. It is like when an employee asks for a raise so the boss says the employee must help him on a task before getting the raise. It is a raise that is not just offered or just declined. It is a way that the boss gets the employee to work on his goal.
Pay attention if you want to survive.