If it didn't obscure his face, can you even describe it as a "mask"? Maybe it was just an, uh, object!
p.s., I'm glad he's dead.
Me, too! I'm sure the guy was what I call an "oxygen thief", in addition to being an object-thief or money-thief.
“And what’s your occupation, Trayvon?”
“I’m an object-thief!”