raywest

Answer: The gargoyle had been watching Preston through his window for a long while and, falling in love with him, assumed a human form so she could be with him.

raywest

Awkward. I mean eww, should've just left him alone as it was a murderous creature who killed for no reason. She could've done the human form without killing anyone you know.

Rob245

Well, love makes people (and gargoyles) do weird and stupid things.

raywest

Answer: She most likely wanted to keep an eye on him, to make sure he would never break the vow.