Lex did not kill the attackers - he was not a mindless, brutal savage. No, he merely left them with some minor mental and psychological trauma that may haunt them for the rest of their lives and may possibly devolve into a Heart Demon. Or not. Who was to say? Maybe with the help of a decent therapist, they could overcome their trauma.
What truly mattered was that they wouldn't be attacking Brenda and Pierre anymore, and also that the rumors about him would continue to spread. Acting without the slightest bit of restraint, since he had no fear of leading trouble back to the Inn, allowed Lex to truly appreciate just how incredibly powerful immortals really were.
