I agree it would be an awesome effect, but the problem is the open spaces. On the Iron Dragon, if there it the littlest bit of wind all the fog disappears and it is never as thick as you wish! The great fog effect on Hulk at Islands of Adventure is because you are going through a tunnel under the footbridge right then, so the fog can't get away. If they were to construct a similar tunnel over some point of Mantis (going into the inclined loop comes to mind) then it would really be able to add up.
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PO!NT OF VIEW - A Different Look at Roller Coasters
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