It doesn't matter. Friends are still friends. Even enemies. I don't like to regard anyone as my 'enemy'. I may dislike someone, but that doesn't mean that I won't talk to you or that you're my enemy.
An enemy of a friend might not necessarily turn out to be someone who I will dislike, and I will damn right make sure that they know this beforehand, so if they ever want to confide in me anything about their "enemy", they know that I might not share the same views as them.
"And that's the reason why I don't want to know anything that happened."