Just something I noticed, and it's been egging me for a while now.
Why do you think that is?
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Shepard's armor was breached from you know, probably from one of the many explosions that occurred when his ship got blown up around him. And Shepard's armor is pretty standard issue, not the insane "shit ton of money and R/D invested in a specialized suit that would kill a typical human" that the Mark VI is. Oh, and Shepard was "only mostly dead".