"Right? I mean not at all my style and just unnecessarily messy." It was one part sarcasm, but far more parts truth. Not that Zacharias Smith really spent any time thinking about how he might kill a person, but he imagined if he did it would be a much cleaner operation. And it certainly wouldn't happen when he was about to get laid - that was just sacrilegious or something.
However, if the cards weren't already stacked against him, he was doing a great job of doing that himself. "Unless that's..." he cut himself off before he said it. Not that stopping himself once proved he was any smarter or more tactful.