stuck with a sentence
I have a difficulty in understanding a particular sentence in the book Curious Case of Benjamin Button.
Clank! The basin clattered to the floor and rolled in the direction of the stairs. Clank! Clank! I BEGAN A METHODICAL DECENT AS IF SHARING IN THE GENERAL TERROR WHICH THIS GENTLEMAN PROVOKED.
"I want to see my child!" Mr. Button almost shrieked. He was on the verge of collapse.
Could you please help me understand the sentence written in capital letters? Thanks already.