The photo on the left looks like it is from the seires of of pics by Cartier-Bresson of the Barong dance. This may indicate correct grip, but then it is a dance, not actual combat, so it is hard to say. In the photo on the right the grip looks different. I can't tell for sure, but it seems that the forefinger is placed on the blabe. I tried to blow this up, but it pixelated too much to tell. The grip used by one of the two warriors is in fact a posed photo, but i wonder if the photographer would go so far as to tell the guy how to hold his keris. It is just as likely that he would hold it in a natural way for him even if the photographer positioned them in other ways.
