The balled fist didn't go unnoticed, but JR didn't particularly care whether the vampire liked what he thought or not.
"I can't just let you go and still be able to look my parents in the eye afterward, even with what you did to save Elyssa." That still left the question of what the hell he was supposed to do with the Vampire. Saving Elyssa and the babies meant that JR wouldn't kill him, but letting him go Scot-free wasn't an option either.
Stalemate.
Sometimes having a sense of honor was a real pain in the ass.