“Hippos attack not to eat people, but to get them the hell away from them,” Lewison said. Larger vessels can offer more protection from a sudden hippo attack. photocech/Adobe StockGet to know the signs of disturbed hippos, Muruthi advised, in case you wander too closely. … If you slap the water, the percussion 99.9 times out of 100 will turn the hippo,” Templer said. Remember to suck in air if on the surface.”Another hippo attack survivor in this National Geographic video also was able to conserve her breath.