how does dr. livesey send the captain to his seat "like a beaten dog?" chapter 1

Dr. Livesey threatens him with hanging.

The doctor never so much as moved. He spoke to him as before, over his shoulder and in the same tone of voice, rather high, so that all the room might hear, but perfectly calm and steady: "If you do not put that knife this instant in your pocket, I promise, upon my honour, you shall hang at the next assizes."