Though, right at this instant, the human living had no way out and could only agree to the demands of his captors, certainly a window of opportunity would arise at one point, even without his dagger and thus, without a way to channel Illusory Undeviginti's vapour, he still remained a competent rogue, the decorated weapons were not handed out to anyone after all.
One needed to show certain qualities and the likes to even have a shot at earning one for themselves.
Naturally, said qualities depended on which Undeviginti you followed, he himself had been a thief and scoundrel for most of his life before being taken in into the worship of Illusory Undeviginti, he had been incapable of wielding the vapour on his own, but his efforts had been rewarded with this singular object.