There is nothing unique about either blog, yours or his, as they both have the same content. While the content may not be exactly the same, missing a few words here and there, they both essentially say the same thing and use the same images.

Does your content differ by at least a 30% change to make it unique? No it doesn't. So whether each of you got together and wrote about the same problem is besides the point. Neither of your viewpoints differ in listing different aspects seen by each of you. All the aspects are the same between the two and that would be considered copying/plagerism.

Posting duplicate content to rape the reward pool is not acceptable and your content will get flagged.