Indeed, I liked the article very much!

Since this Group Read started, I have decided (for my own amusement - strictly off-text) that the only way Mr. Darcy's behavior makes sense (unless he is a complete boor), is that he had planned on being social, but found himself unable to do so once there, and was stuck for it until his party wanted to go home. He must know that not dancing at a ball would be rude, and he could have stayed home.

It would be unfortunate thing to have a bad day happen on his first social event in a new neighborhood, but it fits the facts better than anything else. His recent worries over his sister may have returned just in time to spoil the Ball -- say, a mention of Meryton being about to host a militia, or a letter being delivered from Mrs. Annesly mentioning Georgianna being distraught. Or something unrelated - business concerns, a raging headache, Mrs. Hurst hinting that Caroline would make a good match...