[He did not, in fact, know that. It does not do much to improve his temper. ] What are you saying?! They cannot have. [In theory a Space Marine losing his special organs is dead. Wait. Wait. ] Am I DEAD?!

[It makes sense. He's dead, what was left of his consciousness trapped in some filament of the Warp.]

I do not think you understand the true level of the Inquisition's thoroughness. [Also is he dead? Is this what dead people do? Have conversations? It would explain why the other looks so much like an Eldar.]