It depends on if you are already hit by the spell or not. If you are already hit (or someone else is hit and you want to fix them), Fenite Incantatem would be it. If someone is trying to hit you, the best way to protect yourself would be any variation of protego (protego totalum, protego maxima, etc.)
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The spell "Petrificus Totalus" is a petrifying spell. If someone cast "Petrificus Totalus" on you, you would freeze up and be unable to move or make sound, though you will be consciously aware of what is going on around you. It is very different from a Stunner, which knocks you out completely.
Arestomomentom: slows a face moving object down :)
stupefy puts them into a "trance" and makes them immobile.Perfectus Totealus makes their limbs snap together For a pittence of time.
BTW it's HARRY Depends what you want it for.Expelliarmus- get rid of their weapon/wandAccio- the summoning spell is very usefulImperio- if you have bad motivesPetrificus Totalus- total petrification'The Patronus(Expecto Patronum)- I vote this is the best spell!
In the book, she makes a fire with her wand as Devil's Snare does not like heat and light. In the movie she stops struggling because the Devil's Snare holds you more tightly if you fight against it. she relaxes to fall through it then performs a light spell "luminos" to create light to kill it