Only thing about 'de-powering the warp core' is that that doesn't cover the Bioship's "Death Star" impression, unless you want to say they depower the planet's core or its gravity....which is less plausible then the whole "the borg don't understand them because they can't assimilate them" plot device that they used in "Scorpion" part 1: The Borg never thought to create a tricorder like device and SCAN 8472 !?!
Sorry, the ep was on today on Spike and that was a point of contention in my house. (we are a geeky breed here... )
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"Yes, it's the Apocalypse alright. I always thought I'd have a hand in it"
Professor Farnsworth