Train feeding isn't necessarily power feeding. It's often used to train a picky critter to accept a different type of prey/feeder than what it's used to eating. I've used it to convert adult retics and boas over from rats to rabbits; in the retic's case it was an adult female that only ate rats. The problem is she needed 4-5 jumbos every ten days at a cost of $25 per meal, rather than one $10 rabbit. That kind of money adds up fast.
To avoid "power feeding" you have to make sure the combined weight of the two feeders is correct for the snake.
And yes, if you're not sneaky, quick, and have a very steady hand the snake can avoid the second feeder. The technique takes practice and it's harder with the smaller snakes. It's easiest initially if you start with the snake's typical feeder at 2/3 of the meal and the follow-up feeder comprising 1/3 of the meal.
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