Even though the ghosts and monsters they investigate are mostly people pretending to be what they aren’t, they can really set up traps that look like something from another world. Shaggy, for example, ended up in the middle of a dangerous trap, with heavy rocks falling from somewhere he couldn’t see with all the mist around him. It seemed really impossible for an ordinary man to carry and throw those rocks, but it’s not the time to think about it now, you better leave this kind of question for the smart Velma and save Shaggy from an unhappy ending. Avoid any of the falling stones and make sure he won’t suffer a single scratch, it would make it much more easier for whatever is attacking him to catch our friend and take him to where no one will find him. Do it at least until the monster runs out of rocks.