" For the first and the last time in his life, Corax cried. He cried not for the loss of life, though it was great.
He cried not for the degradation that has been heaped upon his dead warrior, though it was obscene.
He cried for all Astartes, for the shame that Horus has brought upon them. They had been the Emperor's trusted sword, and they had betrayed him. It mattered not that Corax himself had remained loyal, he was Astartes and the shame of one was the shame of all.
'Will they ever trust us again?'
A tear rolled down his cheek and dropped onto the fallen Raven Guard. Should they trust us, was the next question. "

― Gav Thorpe , Raven's Flight (The Horus Heresy #Audio Drama)