I was working in a small restaurant with two floors. A woman and a man came in and I had a table for them upstairs. It looked like they had a first date because they were asking those "getting to know each other"-questions. After ordering food the woman had to go to the toilet, which is downstairs. As she walked to the stairs, the food arrived. She walked down, tripped and fell all the way down knocking her head on the ground. Two colleagues immediately rushed over to her to see how she was doing. She was unconscious and bleeding from her head so they called an ambulance. I went to the man while he already started eating and told him his partner (didn't know how to call her) fell down the stairs and that she was unconscious and that an ambulance was on the way. He walked to the stairs, looked down and walked back to his table to finish his food. Later the ambulance arrived and I asked him if he wanted to go with hem to the hospital and he said no while finishing her food as well. It was so awkward he just sat there for another 45 minutes eating, drinking, paid the bill and left. I still don't know what kind of relationship they had and whether the woman is okay.