Actually Buffy died twice. the last time they buried her. This was the season finale. Yes we spent the whole break speculating how they were going to bring her back. Most speculated she was not really dead. Her death was a sacrifice to save her sister. He death was caused by her jumping into another dimension. They used witchcraft to bring her back. all of the components to do it in this show. Plus the show says Juliette power is unprecedented. So have her play god and bring Nick back.
Embrace your inner Biest..... We all have one