I have 3 of them, 2 standard drop points and a Nyala version.
It's my go to hunting, camping, and woods blade. After a few years of using them and reading every post I could find on the Nyala I've never heard of any specific intention for the shape of the pommel. I'm sure that if the situation arose you could bust a window with it but I'd personally use the tip (unless somebody was on the other side of the glass) to reduce the chances of a serious gash near my wrist. It's probably just an aesthetic curve that Chris liked when he designed the knife.
That said, it can be useful when separating the hide from an animal.