(Scooby sees the man in the black cape is gone.)
Scooby: There were two of you!
Shaggy: Two of me? I don't get it, Scoob.
Scooby: Give them that. (Scooby grabs the costume and shows Shaggy what he's trying to say) Two of you.
Shaggy: You saw somebody else dressed like me? Let's get out of here!