Fixes 2 spell channeling bugs

Created by: clusterfack

If you had multiple spells that could be channeled you could freak the system out by some convoluted combination of using each one.

While it was previously thought to be sane, not intercepting attacks after spells were cast were causing some insane behaviors, (such as picking up food after using matter eater on it), so now a spell being cast successfully will intercept attacks.