Just Say Hello!

Rabbi Pesach Krohn tells a story about a guard who worked in a slaughterhouse. When he was about to lock up the facility at the end of the day, he realized that one of the shochtim had not come out. They went inside to look for him and found that the shochet had gotten locked in one of the freezers. He was slowly freezing to death, but the guard were able to revive him. How did the guard know that this shochet had not left yet?