The power only works once per person and he must look them in the eyes for it to work.

And my power also works according to the rules of our physical world.

The Power doesn't work unless you have had the training.

My power doesn't work at all if I can't talk.

If only the power of the gift worked, she would have done him a turn.

I mean, we don't even have the first idea of how our powers work.

The second is that his power only works on small objects.

Had she taken herself to a place where her powers didn't work?

When John did that, a part of whatever power worked through him spilled into me.

The Astronomer was one of the few people his power didn't work on.