It was shortly after lunch on an all-day game drive in Botswana's Okavango Delta when we stopped at a small natural water hole to photograph a lone Hippo doing what Hippos do, lounging in the water, snorting, staring at us, twitching his ears, rolling over, rising up and down with an occasional yawn at one pint he started to charge towards us. We initially thought it to be a mock charge but the hippo kept coming ultimately biting down on our car