^ I was actually thinking that maybe Aurora could have sent a message to Hook. She knows him and believes he cares for Emma. Plus, Aurora and Philip seem to be “in the know” about the Wicked Witch. They could have easily tipped off Hook just before Zelena cast the curse.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy