[He helps her drag the body over, biting on Cagliostro with his teeth. (Ewwwww).
After letting go, he notice what's hidden down there. Huh, wet areas.]

Probably. Is it possible to get water from the lake without disturbing anyone down there?

[He erred to the side of caution earlier in the week.]

Maybe someone pushed her, while she's fighting them off? [Time to search and sniff for more clues.]