Something's not quite right here - piranhas don't kill people, and rarely even attack. I can't understand why only the flesh around a hand and his head was eaten, either... and where are the bite marks?
What's going on with his head, anyway? Seems like there's some mummified flesh or something; why can't I see inside his eye sockets?
agreed also the blood stain on his head is from a serious head trauma ...and pirahanas hardly ever clean the bone that efficiently (spelled wrong) just saying i have read about them