Snape vs McGonagall

In Harry Potter and the Deathly Hallows - Part 2, Professor Snape still helps the Order when he redirects McGonagall’s spells to knockout his fellow Death Eaters. He also takes their wands before he flies out the window to make sure they could no longer harm any students. In the books, there are no Death Eaters around him so it was a nice touch to add this detail to the movie.