Ok so once you get rid of the rocks to go down into level 3, if you dont get out of there fast enough the rocks will re-appear and you get trapped in the middle of them and have to RC out.

My suggestion: Simply poof players to the top of the slope in level 2 after leaving lvl 3, Echo could probably do it pretty easy with some teleport tiles?

Intentional. Each dungeon has a "trap" that players can fubar into that is able to be released by either going with a group, or runestoning out.