[He sighs a bit at that, the exhale forceful and somewhat frustrated; just...give him a moment.]

...She was with me for a short while, further inside the ship. She seemed under the impression that we were going somewhere; I told her that she wasn't, and then I injected her with...something.

Then I grabbed her by the arm and shoved her out onto the deck, and locked the door behind her.

[...]

There was a chance that whatever I injected her with wouldn't kill the host, but I knew for a fact that it would kill her. I was certain of it at the time, and I taunted her for it over the ship's public-address system after I threw her out there.

Everything from that point was as I told you. There was a massive creature that absorbed a large number of corpses that were already on the deck, and it quickly became that. A pair of people that I was highly invested in killing proceeded to destroy it while I watched.

I just didn't mention Excella's death was related to that incident, as you've noticed.