Personally, these mindfrakking scenes tend to be my favourite parts of CV, as it really adds to the "otherworldly" feel of the games, and let's be honest: if Castlevania can move throughout the world by "disappearing" and "reappearing", doesn't it make sense that it can bend space-time to its will? Dracula is on a mission contra God Himself, so he's got to have some obscenely high-level abilities if he expects to win, right?
Also, concerning the removal of the Belmont clan, one could say that, in making Julius the last Belmont left, he may well have already succeeded, as unless he's got something "on ice", he may be nearing impotency and thus likely to be the last scion, methinks...