Both the 5 and 8 are direct, confident communicators who are not afraid to say what they think. There is an absence of games in this pairing's communication — both speak with a directness that can be refreshing and, occasionally, bruising. Conversations between them tend to be energetic and substantive.
The challenge arises from the 8's tendency to communicate with authority — sometimes crossing from confidence into domination. The 5, who values freedom above most things, will not accept being talked down to or managed, and will respond to that dynamic with resistance or departure. The 8 must communicate as a partner rather than a commander. The 5, in turn, must bring follow-through rather than always redirecting the conversation toward the next interesting topic. At their best, they are two brilliant, direct people who push each other to think more clearly.