After thinking about this overnight, I'm of the opinion that maybe it should let him create traps spontaneously out of local materials. Basically permanent rearrangement of existing stuff, which then remains in place when it's out of his AOE or when the song's over. So he could play the song, walk through the woods, and basically say, "pit trap there, deadfall here", and not have to worry about it continuing to exist.
-- Bob
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For Jor-El so loved the Earth, he sent his only begotten son...
-- Bob
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For Jor-El so loved the Earth, he sent his only begotten son...