You stay as Lisa begins to transform into a werewolf, her now amber eyes glowing in the moonlight. Teeth turned to fangs and she smiled wickedly.
Your instincts tell you to run but you know that escaping would probably get you killed by other pack members hiding in the bushes.
However, Marsha and Justine apparently don't know this (no surprise there) and run off.
Just as you thought, they are quickly taken down by more werewolves who don't hesitate to kill them.
You continue to watch as Lisa's fingernails grow into claws and wonder if you made the right choice.