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I rewatched HP - Order of the Phoenix recently and there was something strange. When Harry gets grabbed and choked by the Dementor at the beginning, he touches the Dementor with his wand and the creature gets shocked (it looked a bit like Stupor), allowing Harry to get free and to cast his Patronus.

Was this a defense mechanism of the wand protecting its master? It would not really make sense that it was a Stupor since Dementors are said to be immune against most spells.

Is there any canonical answer to this question? Could a wand defend its master by touching an attacker? Or was this just a bug?

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Link for clarity: youtube.com/watch?v=jw7nLoDDhfI&t=1m11s –  agweber Jul 7 at 14:50
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up vote 11 down vote accepted

The completely canon answer

Really this shouldn't have happened in the books he is never actually picked up by the Dementors, the only spell he uses other than Expecto Petronum is Lumos to try and find his wand when it is lost on the floor.

“Where’s - wand -come on -lumos!”

He said the spell automatically, desperate for light to help him in his search - and to his disbelieving relief, light flared inches from his right hand - the wand tip had ignited.

Harry snatched it up, scrambled to his feet and turned around.

His stomach turned over.

A towering, hooded figure was gliding smoothly towards him, hovering over the ground, no feet or face visible beneath its robes, sucking on the night as it came.

Stumbling backwards, Harry raised his wand.

“Expecto patronum!”

-- Order of The Phoenix

Also in Prisoner of Azkaban in The Marauders Map chapter Lupin says this

“There are — certain defenses one can use,” said Lupin. “But there was only one Dementor on the train. The more there are, the more difficult it becomes to resist.”

We never hear of any other defenses than Expecto Petronum and Lupin later goes on to teach harry Expecto Petronum although he does say he is not an expert in fighting Dementors.

Harry had a sudden vision of himself crouching behind a Hagrid-sized figure holding a large club. Professor Lupin continued, “The Patronus is a kind of positive force, a projection of the very things that the Dementor feeds upon — hope, happiness, the desire to survive — but it cannot feel despair, as real humans can, so the Dementors can’t hurt it. But I must warn you, Harry, that the charm might be too advanced for you. Many qualified wizards have difficulty with it.”

The Quote above confirms for me that he did not do a short burst/stab of Expecto Petronum has it really doesn't damage the Dementors also as per book canon nothing damages a Dementor as a Dementor cannot be destroyed. Expecto Petronum merely repels the Dementor with positive energy. In canon there is no explanation for how what he did affected the Dementor, there are however plenty of explanations and possibilities for what his wand did or what he made his wand do.

  • Wizards cast spells when they lose controls of their emotions, Disappearing Glass and Blowing up Aunt Marge.

  • Non Verbal magic, in the Potterverse a spell can be cast without uttering the words but by thinking of them.

  • There are other explanations one which would have less foundation would be Harrys' wand being special take for instance when it snapped Voldemort or Lucius' wand in the Deathly Hallows. Harry has always swore blind that it was his wand that did that and Harry had no part in it.

I have however never heard of using a wand as basically a Cattle Prod, the closest thing I would think is casting stupefy at close range.

The movie answer

To make it more dramatic Harry had to fight off the Dementor first and have this struggle. On screen this looks much better than Harry stumbling around on the floor looking for his wand in the dark.

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Just to try to add to the movie scene, I would imagine Harry could have been attempting to cast Expecto Patronum but could not properly speak, thus casting a weaker version just to snap at the Dementor. This would allow him just enough footing to recast it with more force. Reviewing the scene though does make it look like a cattle prod. –  agweber Jul 7 at 14:52
    
@agweber I'm not sure a spark of Expecto Petronum would be enough to stumble a Dementor the whole point is that it acts as a barrier it is made of the energy they feed on. A corporeal Patronus can repel and push back where as a non-corporeal just provides a wall between the dementor and the caster. –  Simon Jul 7 at 14:56
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Wizards have been known to cast spells unintentionally (mostly young wizards who don't have control over their magic), usually when feeling a strong emotion (fear, rage,...). This could be one of those cases where Harry 'reflexively' cast a spell (probably a very small patronus)

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