According to the listings for "Mind blank" its supposed to cut off the creature you use the spell on from any attempts to sway its mind. Therefore it is possible that it worked but you don't know it worked. Unless you tried to charm it, or cast the fear spell on it.
Spoiler
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-in the prologue it could have been used to release the the ogre from its headache.
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Its time for me to act like a man. And hide.
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