He needed her tears to keep Hook away from her as leverage to get her to do what he wants. To me, it makes sense. However, I don’t like that we got another maguffin in Savior tears and I don’t like that Gideon has now somehow switched opinions on this and now wants Emma to help him kill Black Fairy. When did he realize this? We needed to see this. Did Rumple help him realize this? What about all that magic stealing from the sword via Blue Fairy? All the stuff with Rumple not wanting Gideon to do anything bad and dark so he would do it for him? So now, Gideon is being good trying to take out a bad person?