"No, by thunder; we have come out to get our man, and we will do it. We after the convict, and a hell-hound, as likely as not, after us. Come on! We'll see it through if all the fiends of the pit were loose upon the moor."

为什么上述摘录中，“We after the convict, and a hell-hound, as likely as not, after us”  没有并列或从属连词，也没有谓语动词，但是却使用了句号，表明这是一个句子。 

这是为什么？