[Suzerain of Sheol]

Agreed, it was fine.

And Galla gave a perfect explanation of why that happened. It essentially illustrates the difference between the two of them and the interpretation of their dogma. Thomas was a control freak clinging to meaning in his life by slavish enforcement of defunct or irrelevant laws; Diogenes' only concern is the destruction of Hellspawn and the continued safety of humanity.

All the antics up to this point were distractions to the mission and signs that Thomas was unfit to lead, this was merely the culmination of that. He was weakened to the point where Diogenes could kill him; Diogenes gave him the opportunity to prove himself, and he failed. Thus, what happened.

Now we need Salone to come up with a genius plan to preserve the status quo here and let us finish the mission together. Perhaps indicating that without the priest, we'll be nearly helpless against what lurks ahead? Maybe Na'lsa even knows who's down here...