Maybe I had better shoot him, before he shoots me, especially since, even if he doesn't want to kill me, he's probably worrying right now that I might kill him before he kills me. "And so on.
Quizás debería dispararle antes de que él lo haga especialmente dado que, aún si él no quiere matarme quizá ahora está preocupándose de que yo pudiese matarlo antes de él me mate. "Y así sucesivamente.