Boone is dead. After re-activating Helios One by myself, I went to retrieve Boone and ED-E from the front door of the observation tower. We walked out, autosave kicked in. Boone gave a non-sequiter response ("I just killed my last legionnaire") and ran back inside. I go back inside to get him and he's lying there dead. No robots nearby, no damage given to him, nothing -- just dead. Boom. Companion quest failed. Autosave is, of course, on the inside of the door and my last hardsave is an hour ago. Eff this. So much for the sniper of doom.
Any thoughts?