hmm
what about a paralyzing/immobilizing spells? would dresden be incapacitated if xykon rendered him incapable of moving/speaking with Hold Person? or would he be able to defend against it/fight through it/etc?
note, i don't know that xykon would actually use this in a serious fight, because he typically only uses it in situations where he's already won a fight against a non-threat.
for example:
http://www.giantitp.com/comics/oots0659.html
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DROP THE R AND BACK AWAY!