Board Thread:Questions and Answers/@comment-27.147.226.25-20170802211849/@comment-78.194.252.210-20170803183412

Well, the problem of servants is mainly they body, their essence of prana. They are made of magic, therfore they will affect them like magical weapons. But they will deal no great effect against them, which is why he doesn't even think about use them against servants (if we deal with the fact that servant's weapon are made of prana BUT can stop them, which is why he doesn't use them on servant, it's fair to assume that they are too much dense existence.

Also, just disappearing in uncorporeal form would render the bullet uneffective even if it's work at first time.

If humans have a body and that magic circuits are in their souls, Origins Bullets tend to force the magic they are circulating in their physics, which destroy them inside. But in a magical body, made to receive it, it woul at best force him to pass as ghost to get this bullet and it's effect out.

Also, the Origin Bullet affects Circuits because in case of magi it's the only magical natures in them. In a magical body, it's made up to damage it, so his function shall be basis.