User blog comment:AdmiralPedro1stFleet/FANS PLEASE READ. Drew Karpyshyn's ORIGINALLY INTENDED ENDING/@comment-1440333-20130525133723/@comment-1786741-20130525194234

Exactly, an advanced EMP that only targets machines with AI (which I'm still not sure WHY it effects Shepard, other than to say "lol, you can't have an ending where Shepard is alive and happy"). And control isn't all that much of a stretch considering the Catalyst built the Reapers, I'm sure he already had SOMETHING where he could control them if need be. Even if not, it's FAR more difficult that, like I said like 4 times, rewriting DNA to make them part synthetic. That stuff is ridiculously difficult.