And that explains why she was so insistent on looking in the tank when I found her.

Even so, Nova, you wanted to be rid of the sharks here as much as you wanted to be rid of the evidence. Killing Ema, the one person who's consistently helped investigate bodies, and making her own cause of death unrecognizable by feeding her to those things... It wasn't just covering things up, and it wasn't just your sense of irony. Your grudge wasn't against Ema.