So I find that I’m really confused about this failsafe. What is it, exactly? Did Rumple write it into the Curse. Did Regina adapt the Curse with this fail safe?
Excellent questions. I’m wondering if the failsafe is activated magically, or if there is something physical that must be done. (maybe related to Maleficent) Using Hook to do dangerous physical jobs sounds like a reason Regina would ally with him at least temporarily.