User blog comment:James12708/Reapers VS. Forerunners VS. Angels from Darksiders VS. Humanity from Halo VS. Council and humanity from Mass Effect VS. Imperium of Man/@comment-50.80.96.33-20130110091133/@comment-1683193-20130111065655

Except you need to be near a reaper to be indoctrinated. If a Reaper got near a Forerunner colony,the Forerunners would just blow it up or use Supressors to indoctrinate the Reaper.