☄ The attendant will continue to try and sell him on it until he pulls out his weapon on the attendant, it's immediately obvious that she's frightened. A small metal barb will hit him; the owners must have security constantly watching. One of two things might happen - he'll either immediately pass out or he'll have enough energy to get away. Possibly he'll yell for help and someone will come to his aid, though they risk being hit with the dart as well. Which scenario?

Note: I'm leaving this open so that you can let me know now how horror/scifi ish that you want it to get. If you want another character to be a part of it, then maybe the yell for help and both get darted? Let me know.