Please answer.

And older woman and her daughter, a young man, and an older man are traveling i the same compartment of a train. when the train passes through a tunnel, it goes dark. They hear a kiss and a slap. As the lights come back on, they can see the older man with a black eye. This is what each of the passengers thought:

The older woman:"He deserved it. I am glad my daughter can defend herself."

The daughter:"I cannot believe he preferred to kiss my mother of that young man over kissing me."

The older man:"What is going on here? I didn't do anything! Maybe the young man tried to kiss the girl, and she mistakenly slapped me."

The young man: "I know what really happened."
Do u know what happened?