Vince (the guy on the walkie talkie)

I really like how they made sure to connect the dots. It's really easy to tell that the black guy in the booth at the end is the same guy on the walkie talkie earlier in the movie.

Kind of a realization moment for both the audience and the character. The look on his face is like "Hoooooly...fuck", since he realized he was being dumbass and thought someone was playing pranks and not that a girl's life was in danger, lol.