They're getting closer and closer. You must act or it'll be too late. You grab a pen from the table close to you and stab the neck of the closest one of the two. His look gets from surprised to horrified as the blood stars bleeding on his clothes. He turns around to face the other colleague who is panicking out even more. "I'm sorry, I'm so sorry" and turns back to the door. He is definitely not prepared for any action of this kind, and definitely not paid enough to put his life on the spot. While he runs out, you're left in the room with the bleeding one who's now sitting on the floor trying to push on the wound with his hand.