There is a scene in The Magician's Apprentice where David uses magic to make the mop bucket move, and the floor is full of water, and then balthasar says.

You mean from the cinema or pps?

I remember what the movie said: You desecrated the sacred magic, and you desecrated Merlin's ring. Magic is not a game. You can't be opportunistic. If you just fall into charged water, you will lose all your magic.

It seems so. I hope it helps you.

(* _ _ *) Hehe ...