Board Thread:Spoilers!/@comment-5899967-20170927102346/@comment-24314171-20170928172036

Maybe Emma is really pregnant, then, the curse comes and she's obligated to leave to save the baby's life. Killian promises to protect Henry in wherever they're going (HH). And there is a emotional scene with her saying goodbye and they promising they'll see eachother again. That is a good excuse.