Perdita swung the knife and positioned its tip at Mrs. Perkin. She warned "One more step and I'll do to you what happened to your husband when he tried the same thing."
"W…what did you do to my husband, you witch?!" Mrs. Perkin tore at her clothes in frustration and fright. Seeing the knife pointed at her and the crazy look Perdita now had with her red eyes, she couldn't say she was not scared. She started regretting her decision to come and confront the siblings. She thought it was a wise thing to do. But now, her wise decision had backfired on her.
Vampires no matter if the person was turned or not, when they are angry or bloodthirsty, exhibited a certain wildness in them that made them look feral. And a bite from them wouldn't guarantee that the person bitten will live to see the day again.