Emma or Regina might be able to remove the curse, so Hook needs to tell Emma what happened. Besides, it should be Emma’s decision as to whether or not she is “allowed” to kiss Killian…..even if the cost is her magic. Yes, they need to deal with the WWW, but this decision needs to be hers. Not the town’s, not her parents, not Henry’s, not Regina’s, not even Killian’s, and certainly not Zelena’s!