Hi Greg,
I agree, hunting for sport,with high powered rifles, to me is distasteful and hardly 'sporting'.
But hunting with spears is a whole new ball game ...and yes AFAIK Hippo's have killed more humans in Africa than any other animal. An agitated Hippo is extremely dangerous and are surprisingly quick and agile (over short distances)

Apparently their breath is absolutely foul .......but I don't think it could kill you