User blog comment:AdmiralPedro1stFleet/FANS PLEASE READ. Drew Karpyshyn's ORIGINALLY INTENDED ENDING/@comment-1440333-20130525133723/@comment-1786741-20130525204201

Yeah, that's one thing that can be explained. Because A, Shepard is not an AI which is the only thing that gets targeted and B he is the only exception. It may be him being in direct contact with the explosion or something but it's not all that complicated.