Ursos was screaming and explaining that he was not supposed to do that: "We can not interfere, we are only here to pick up souls and not to kill humans."
Ursos: Oh, boy, this is terrible, really bad!! Deus Mortis will send Lykos after you. Telos, are you listening? LYKOS!! Do you have any idea what have you done?
But Telos could barely hear what he was saying. He didn't care, something snapped inside, and there is no more turning back.