This is such a cool part!
Rachel was mortified; this city girl had the gall to tell her how to dance! Rachel could see the Kents out of the corner of her eye and felt it would be a good time to reestablish her relationship with Clark. She sidled up to him and putting her arms around his neck went up on tip-toe to give him a kiss.
Putting his hands on her upper arms and pushing her away slightly, Clark stopped her and said, "No, Rachel, we can't do that."
Surprised, Rachel challenged, "Why not?"
In a tone barely above a whisper, but in a tone loud enough for all those nearby to hear, he replied, "Because, I'm getting married."
Poor Rachel! The look on her face when Clark drops this bomb must have been a mixture of shock and surprise. She waited waay too long to 'reestablish' her relationship with Clark.