Board Thread:Spoilers!/@comment-6274680-20171113235602/@comment-34657163-20180314232411

So judging from the promo pictures and promo (for the flashback):

Flashback starts with Hook planning on releasing Alice out of the tower. He goes to Rumple (Wish Realm) and finds out about Ahab and Maui's hook. I imagine the whale was probably someone using the hook to transform into one? Anyways, they duel and Hook brings Ahab back with him to Rumple's cell (or Ahab follows him) and either way, gives Hook the hook. Hook leaves to go free Alice, when Gothel decides to appear and knock him out of the tower, along with giving him the curse of the poisoned heart.