Before jumping mindlessly off the ledge into the beast room, you might want to check that there isn’t any siege weapons on top. If there is, you can aoe them down or do some other trick like mesmer casting his mirrors there etc. This will work on most campers. If there is huge group camping with multiple siege weapons, then just come back some other time.
This jumping puzzle is one of my favorite things in game. You can have huge loads of fun in this puzzle with friends and it is also great place to make new friends in game. Dont get mad if you get griefed and try to find a way to counter them, there is plenty of ways to seize popular camping spot from enemy and it is really great feeling when you succeed to do so.