Sure takes a lot of those spears to down a hippo, the elephant was pretty tough but that hippo was a real survivor. They must have had the whole tribe on that hunt, must have been 40 spear chuckers there.
Some of those guys were running like school girls after they threw their spears, I don't know if you really need big balls to do that, you just need 40 friends with spears to get the courage up a little higher.