Tarja Turunen (ex-Nightwish) has shared footage of herself performing a cover of Slipknot’s “Vermilion, Pt. 2.” This track is from the singer’s newly released live album, “Rocking Heels: Live At Metal Church.” That effort was recorded during a set at a church in front of 300 people before the 2016 Wacken Open Air festival in…