I agree with you @obisgirl. It maybe that Emma has to conjure an image to save her, maybe like Regina will conjure trolls and whatnot, and Emma has to conjure something that can defeat those and protect her. She then creates a knight in shinning armor and he defeats the trolls. After the fight, the knight then takes his visor off and BOOM! It’s Hook’s face. Emma would then realize that one of her strengths is Hook and her feelings for him.