Not fake. This can happen when shooting at iron/steel targets although I've never seen a round come straight back quite like that. The dude is very lucky.
The chances of this happening are so close to zero that it's lucky they got it on tape. However, you can tell by the whistling noise of the returning bullet and the long delay that it probably didn't come straight back at him, but arced up on a huge parabola (thousands of feet high possibly) before bascially falling on him.
If it had gone that high, it'd have taken much longer to come back down. It more than likely just returned on a slightly higher trajectory at a greatly decreased speed.