I have figured out yet another way to do this, and it is even better. You put a func_wall brush that is 1 unit off of the ground, and 1 unit in width. Make it invisible (Render: Solid FX: 0). Make the length as wide as the rotating object. When the rotating object pushes you, you will be push up against this invisible wall, and you will die, given the proper damage amount when blocked!
I put 8 different brushes on the ground, but you can put more if you want a more realistic "moving death object". It appears as if the rotating object hits you, and then death!
Btw, you do not ever even notice these brushes when walking over them.....they are so small.
P.S. I could submit a tutorial map for this if you would like.
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