There, on our favourite seat, the silver light of the moon struck a half-reclining figure, snowy white…something dark stood behind the seat where the white figure shone, and bent over it. What it was, whether man or beast, I could not tell.
– Bram Stoker
Dracula, Chapter 8. Mina, searching for the sleepwalking Lucy, witnesses the attack by Dracula on the innocent Lucy. She could not tell if the attacker was man or beast.