This could go a number of ways. These are what I think are the two likeliest:
1) Emma CHOOSES to kiss Hook, and Zelena’s curse doesn’t work because it was Emma’s choice, TLK, etc. Going back to 307, Hook tells her that when he wins her heart, it will be because she wants him. No trickery.
2) Hook tells them outright, trusting in Emma and her family’s abilities to overcome Zelena’s threat. Hook would be taking the ultimate leap of faith believing in her.
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