I just don't see that. When shot hits at an angle, they will leave "skid" marks, these appear to me dang near head-on. that thing was sawed off and if you've ever seen what those do, the pattern expands almost out of control immediately. This was REAL close and if it were a normal 12 or 16 load, there is NO way that little bit of material could stop it like that... metal or otherwise. I don't know if even kevlar that thin would stop it.
I am just having trouble believing what I am seeing that's all. maybe the powder was wet or something and just puked it's way out the muzzle...