In "The Oracle of the Dog" by G. K. Chesterton, the author was talking about a secretary of a murdered colonel, who was very active and always doing everybody’s work, saying (emphasis added):
"It would be a joy to you to watch him make things hum, as he calls it. He made the house of mourning hum. He filled the funeral with all the snap and zip of the brightest sporting event. There was no holding him, after something had really happened. I’ve told you how he used to oversee the gardener as he did the garden, and how he instructed the lawyer in the law."
What's meant here by "after something had really happened", as I don't see anything in the whole paragraph to indicate this particular "thing"?