Creative and (maybe) technical help

There is a part of my map where the player has to fly downwards bhopping on a few blocks in a spiral fashion. Problem is: player can just jump from the top one to the bottom one.

Temporarily I have placed teleport brushes to prevent this from happening but it's not quite in my mapper's book to have invisible things granting map control.

Would like to hear some good ideas on how to make this better (placing a visible wall in the way is not an example of good idea).

Screenshot: http://i46.tinypic.com/2qks1o9.png

fof_32 have something similar to that , use teleport brushs on the gaps between the bhop blocks.

I dndt see the problem of invisible teleport to "map control"

You can also try to make it harder to jump from the first block to the last one, with for example upturned stairs which the player's model would hit if not "flying" the right way, something like kz_ea_spiral architucture-wise. It'll then be considered as a sc/skip