Somehow, the sound conveyed a new determination on Forbes's part.

He had his back to the wall.

No matter what view the law took of his action subsequently, he would protect his dear ones at all hazards.
After that, Theydon hesitated no longer.
"Bates," he cried, "throw into a bag such clothes as I shall need for a few days' stay in Mr.Forbes's house.

When I am gone, pack your own boxes and take a week's holiday.

Go anywhere you like, out of London, but go at once.