Can a mandrill kill a human? Not important. A big Mandrill would tear up a human. Baboons when they fight to kill attack with a reckless abandon that's very unusual (Baboons literally throw their faces at each other with teeth bared to injure one another which also leaves them wide open to injury).
Do mandrills eat humans?
Herbivore. Grass, fruit, seeds, fungi, roots and, although they are primarily herbivorous, mandrills will eat insects and small vertebrates. Leopards, crowned hawk-eagles, chimpanzees, snakes, and humans.
Are mandrills aggressive to humans?
Simply behaving like a baboon would with different baboons might severely injure a human. In the event that they really feel threatened or turn out to be agitated, they may very simply severely injure and even kill you.