Welcome scatteredminds,
Like the rest of the gang, awaiting for clearer pictures.
Kai,
Afaik, blade standing on it's tip have 2 methods. The physics method, like you mentioned, balancing on its tip with no magic required and the esoteric method supposedly from horizontal position rising up to a vertical position.
Btw, congrats Kai on your new bahari... a lovely blade.
scatteredminds,
If your sister witnessed the esoteric method, then esoterically speaking, the blade might have been 'imbued' to enable it to stand. This is normally done to demonstrate that the blade had been given supernatural capabilities. Referenced from Bambang Hasrinuksmo's book, it is said that the so-called 'imbued power' might be for a specific purpose.
Now, for an example of the balancing act method, follow the link.
http://www.kampungnet.com.sg/modules...view_album.php
Hope it helps. Btw, the keris looks like a good keris to me.