This Isn't The First Time
Back in 2015, a beach in Australia faced the same issue. Apparently, a Blue Dragon was hunting another deadly sea creature, the blue bottle jellyfish. The harsh Aussie currents were no match for the tiny slug, and they eventually washed up, causing mass confusion among beachgoers.
Fairytale Creatures
These little slugs look completely fake as if they were created using CGI for a hit movie. They're plenty real! When they are found outside of their normal habitat, it usually causes a bit of a mass panic... After all, you don't want this brushing against your leg in the ocean! Especially if they are hunting.