In my opinion, Henchmen should not be allowed to Fizzle. I recently entered into a boss battle, and decided to buy a level 70 henchman to help out. He fizzled 5 times during the fight making him almost worthless. This is not right. I already spend enough money in Wizard 101, I don't think it is fair that I spend it on something that doesn't work half the time...it's like false advertising.
It was just bad luck... sorry bud, but no one said you HAVE to buy henchmen. I made it through the whole game on almost 3 wizards without a single henchman.