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Harry Potter and the Deathly Hallows: Part 1 Walkthrough Level 9
After the cutscene, Harry will fight against Nagini - the snake.
You can't lock on and can't use any other spell but Stupefy, so aim for the head and wait until the snake stops moving the head to shoot at it.
Continue using this Method.
After some time there will be a cutscene and the fight will continue in the next room.
Nagini is faster now, aim for the head and watch out.
Then you will fight again, for a 3rd round, same method as before.
Then after a while there will be a cutscene.
Continue to fight Nagini off.
Then the fight will end with a cutscene.
Again, you will be prompt with Encounters, same as before finish them in any order to continue.