So yeah, im doing my second playthough and while hunting some giants and mammoths near the Sleeping Tree Camp (level 9 so i basically shoot and run a lot), i found Malik, sadly i couldn't talk to him cause some stupid giants were hunting me, and i think they were attacking Malik just before i attacked them, anyways, after a while, while i was still being followd by a mammoth (shooting and running still..) I saw this ghost.. it was a horse, ridden by a headless dude, pretty awesome i must say, hes fast so i couldn't catch up with him.
So any clues about this guy?
And svcks i couldn't find Malik again after all this mess.

Just a little easter egg that Bethesda added in. If you do manage to follow him, he will lead you to Hamvir's rest, where there is a Master-locked chest and a few undead enemies for you to take care of.