ok I have a question about this, but it will spoil the ending of the book/movie if you haven't already read/seen it. So I sugest not reading further if you don't want to know
Ok, so at the ending of the book when Harry is fighting with the death eatters and the order shows up. Sirius is knocking into that arch thing. I've read the book and seen the movie but I still don't understand what that is. Why does it kill them?
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