Define weak minded. Someone who's in a bloodlust could very well be weak minded since they're so focused on killing that they miss out on minute details that would convince them to kill someone. For example, the difference between someone who's just really, really angry and out for blood, or someone who's going psycho and just killing indiscriminately. Both may make someone go into a bloodlust, but for different reasons and different mentalities. But yeah. It's more trouble than it's worth honestly, you're better off with an enemy scan ability. Much more utility and much less fuss.