Board Thread:Spoilers!/@comment-25375217-20170119000258/@comment-25926288-20170414005532

Sneak Peek 1: https://www.youtube.com/watch?v=pFA5ZAwjPGo

So, Zel and Reg perform a spell that would weakens the spell's magic called darkness here, but they mean dark magic. Because of a failsafe by Queenie, the heart's weaken instead of the sleeping curse. Thus, the heart's will both be so weak that both will be asleep.