Using Brackets for Clarity
You may not use brackets often, but they can become helpful punctuation in academic writing as you integrate quotes into your essays. You should use brackets when you have to alter text within a quote to make something clear for your readers.
The brackets let your readers know you have made changes to the quote in some way. The material inside the brackets is your addition.
For example, if you need to add information to a quote for clarity, you would use brackets.
Here, your readers would know the vampire hunters were not a part of that particular quote and you added the words for clarity.