that was under the influence of the Mass Hysteria Event, which exacerbates everyone's worst traits. killing the friend i think you're talking about was because he saw him as a threat to chase (leo's overprotectiveness and possessiveness), and he did try to stop the bleeding, but after that he refused to acknowledge there was still a problem (his avoidant tendencies). as for using him sexually during that time, i dont remember that? i thought they just cuddled?