What concerns Billy does concern me.

And if he doesn't make her happy, I'll--I'll kill him." In spite of himself Arkwright laughed.

The vehemence of the other's words, and the fierceness with which he puffed at his cigar as he fell back in his chair were most expressive.
"Well, I don't think you need to load revolvers nor sharpen daggers, just yet," he observed grimly.
Calderwell laughed this time, though without much mirth.
"Oh, I'm not in love with Billy, now," he explained.

"Please don't think I am.

I shouldn't see her if I was, of course." Arkwright changed his position suddenly, bringing his face into the shadow.