The case with Vriska was her clock was destroyed while delivering judgement, and it got stuck on permanent just mode. When John is killed by Bec Noir, we see the judgement that revives you is the middle of the clock, which is where Caliborn was when he destroyed it, making all his deaths neither just nor heroic. It's all a meta thing, honestly.
Or it could be that Caliborn broke his into lots of tiny pieces whereas Vriska’s clock only had the face broken and the pendulum stopped.