"To me, what might be good but still wrong is opening up later on. Maybe when that furiousness in the person might have calmed down"

This is really food for thought. When someone is angry is rather better for someone to apply wisdom in dealing with such a person at that moment rather than setting the record straight to say the truth. Though he might later know but that moment must be treated with care, and as a result of this, lying might be the only option. Great post @sommylove