When I do the death singer, I tell everybody not to shoot until both witches are lured out because she wont sing her song yet.. but sometimes, even after we have both witches are killed, she still doesn't sing her song. I'm wondering it it's just a glitch or if there's a specific thing that causes it.
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Hitting the two sword wielding Knights who are right at the start (as you exit the underground room) starts the song, you can kill everything (including the 2 wizards), then you hit the Knights and she starts her song, then you can kill the shriekers, thats my teams tactic it makes it so much easier