Because Petersen's not done yet, Anna's not done yet. Overnight Friday, the whole resort will start to grow over with vines and thorns. By Saturday morning, everything will be covered. Absolutely everything. The vines will move for employees going in and out of their houses, and when they're leaving the shops & other buildings - but will keep people from going into the shops and such. They will follow Petersen and attempt to close in on him. This is full on Sleeping Beauty, Rapunzel, fairy tale thorns. And they are EVERYWHERE.
Previous plots (green roses, guest lodge flooding, and dead vegetation) still apply.