When that person comes after Baxt, I doubt he would realise that who she had been spending time with.
I take it that the other form of the killer is some kind of predator (e.g. Tiger, Wolf, Bear, etc.).
Something with BIG CLAWS would definitely do the job! Or fangs, for that matter ;)
OR maybe he just never trims his fingernails on his left hand.
You never know; comics like to throw their readers for loops some times.