First, His goal is the Stone of Qina, which is very crucial, and it's best not to have anyone disturbing what He is about to do next.
Secondly, from His perspective, Sela is very suspicious.
If you're truly devout, then why are you here?
So, it's quite normal for Tooth Spirit to kill Sela at this moment.
After all, He's not exactly a totem of high morals, as seen in His previous dialogue with Qina.
These believers and such are merely tools to Him, kill them if you must.
"Then this line should be explored thoroughly enough."
Rogel pondered while pinching his chin.
Without entering the tunnel and squeezing through the crack, these might be the only turning points.
"Let's try the follow-up of entering the tunnel first."
Rogel, eager and excited, began another round of attempts.
…
[Under the Bishop's persuasion, you participated in the secret ritual. Although unaware of its purpose, you agreed without hesitation.]
