In the Introduction, when Chuck first opens the elevator doors, he sees several people running around, followed by the man in a sports jacket stumbling into view, stating "Oh God. Oh God, she got me. She got me...", holding onto his stomach as blood drips out. He then stands still for a moment, and is bumped into by two other survivors, letting out a growl each time.
He then turns around to reveal that he has turned, and then starts limping towards Chuck as he attempts to open the elevator doors. But before he reaches Chuck, another man runs by, and the zombie grabs him, and throws him onto the ground, where he begins to devour him.