septics firing 50 cal...whoops

Excuse my ignorance about guns but how does a big bullet going supersonic in one direction come back & hit him on the head?.
Been discussed on here before, but it may have been that the round was seriously mangled/fragmented on impact with the backstop which explains the trajectory on the way back (note strike about 10 feet in front of Mr Lucky).

Don't .50 rounds have a BFO steel penetrator at the core? One lucky bugger anyway.
The round came back from a steel plate target, hit the ground ahead of the shooter and ricocheted again to hit his ear.

Assuming it's the same video that I've seen every time before....

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