[The jury is still out on if Astartes can still be considered human. Gadriel thinks himself, clearly, better than humans. Humans are fallible and blasphemous, even the 'good' ones like the Cadians.] There are worse horrors. Being helpless in the face of unnameable evil is worse.

Then you have nothing to regret. [If you did your sworn duty, all is well.] I hope one day to do the same.

Then they likely keep them in the Immaterium. Chaos itself. [He KNEW it. It all makes sense now. He may in fact just act out anyway. ] Chaos can never force me to betray my cause.