Course who’s to say that Zelena is telling the truth to Hook. Emma could loose her magic and her family ends up suffering.
This. By kissing Emma, he is making her powerless to fight the witch. Atleast if he doesn’t kiss her, Emma still has the potential to defeat her. Personally, I would tell Emma and let them protect themselves anyway they could. Because if he makes Emma powerless they are just sitting ducks anyway
[adrotate group="5"]
"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC