I just saw a post saying that maybe there was a part of Bellatrix that cared for Sirius since, instead of using Avada Kedavra, she used a red curse during the fatal battle, which the OP attributed to Expelliarmus. And I didn’t have the heart to tell the OP that Bellatrix Black Lestrange most likely was using the Cruciatus Curse, her personal favorite, and that she wanted to torture her cousin before killing him.
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