Board Thread:General Discussion/@comment-1957688-20130902233726/@comment-3257939-20130909190734

Maybe Adam fought a fearsome grimm in the past which was his greatest combat in life so he's keeping the mask as a trophy. For the first time I saw Adam, I always believed that his mask didn't resemble to a grimm, I always though it was a grimm's face and he just make the holes in it to see. Just like the mask of the man who brought Roman the dust in episode 8, the holes in the mask may be how the people of Vale make them.