The slip-up occurs when the head of the bank is taken hostage by Riddick and is taped to a pole with duct tape. Horatio is driving through the building when he hears a loud scream. He stops and notices the bank guy. When we see the bank guy, he is gagged with a cloth, and we hear low muffled screams. It doesn't make sense how he was able to scream so loud to get Horatio's attention while he was gagged.