What's his name?
I can't tell you his name...I know it but it's just not appropriate. His credential are himself (he is trustworthy), his house, his photos, his friends etc i.e. his history. Basically sure, you wouldn't run into a firefight waving your hands around but if someone was right next to you and pointed a gun at you and asked for your wallet or to turn around, I'm saying that they are vunerable - it's that simple.