You just need to make sure to not lead a Union with them unless you really have to, and move them out of the Union afterwords.
Since they can't counter attack, rarely ever let the enemy have the chance to attack them. They are very good (Although I peronsally find Cruz useless, since I can just waste said Griffon Rider with everyone's favorite Princess) you just need to use more planning out beforehand.
And yeah. Bloody Claw is pretty awesome, lots of BFs later on in the game are either Evening or Night locked by the way, lessening Cruz's usefulness.
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