This kind of virtual audience engagement in the movie-watching experience has been done before like in one of the Gremlins movies and Arnold Schwarzenneger's Last Action Hero. But with new 3D technology, this promises more realism. But, like old-fashioned B movies, some effects still use tried and tested methods, like the pickaxe-over-arm technique.
In the sequence shown, masked pickaxe murderer strikes a victim, but the attackee actually brings his arm up against the pickaxe (rather than the weapon driving into it), which is really stationary, and thus hides it behind his upper arm - making it appear as if it's pierced right through.
This movie stars Supernatural's Jensen Ackles and Bulletproof Monk's Jamie King.
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