I was walking next to a river in a game reserve in South Africa a couple of years back, and I was warned about the aggressive hippos. Had my G20 in my camera bag, as carrying it openly was against the rules and would have got me thrown out of the park, but I felt a LOT better than carrying a stick. I would not willingly go up against a charging hippo, but if I have no choice, so be it. A G20 with 16 rounds at your disposal makes for a very formidable weapon, if you can hit fast and accurately, there is nothing in this world that can stand up to it indefinitely. Ted Nugent shot a charging Cape buffalo with one, and it was a one shot kill if I remember correctly.