http://i.imgur.com/dzEU1yV.jpg?fb
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Seems a bit drastic to seriously weaken your base on the off chance some one rocks up with only EQ spells.
I would prefer to use my EQ spells on buildings to get that 50 percent. I use jump spells on walls, or rage/healing on a whole bunch of Archers and my Archer Queen.
EQ will probably be nerfed in the future, so I wouldn't stop walls for just that reason.