What Went Wrong?

Derek had received quite a few slaps over the years. Spoiled rich women tended to be very quick when it came to slapping people. And for people who never wanted to do anything themselves, they were often very enthusiastic when it came to being violent.

Needless to say, Derek had gotten quite good at dodging slaps and vases too. But with all the slaps that he had been dodging.

He had never once expected to have a slap coming his way, originating from one Emily Molson. She was the last person he had ever expected to slap him. But she had done it. No pausing, no hesitation. She had just raised her hand and struck. And as Derek lay in his bed on Saturday morning thinking over what had happened, he still could not come up with a plausible reason.

Why?