I have two possible explanations that would fit in the world of these movies. When Saruman took Gandalf's first staff, he sucked the power out of it and put it into his own, making Gandalf (its true owner) the only possible target for the fireball. Or: Such outbursts require a certain amount of energy and during the Ent attack on Isengard, he was simply low on power and needed until the scene with Gandalf etc. to recharge. Neither of these explanations makes any sense to me. I choose to believe that P.J. messed up for the sake of showing off a really neat special effect.
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But all the while I sit and think of times there were before,
I listen for returning feet and voices at the door.
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