Maybe Belle brings the dagger to NL (before any kind of changes to it) and it plays a bigger part in the PP story? What if PP needs Henry but before PP can kill him (I’m going on the assumption that PP does not have good intentions for poor Henry) he needs the dagger to do it. And Belle unknowingly brings the dagger thinking it could help Rumple in some way?
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"He was a lot of things to me" "The only conclusion was love"