Curse (Percepted weirdness)
I won't bore you with: "some kind of curses work this way, and other that way", BUT in this movie that was definitely weird. Seconds before the witch queen almost completely dies she casts a curse that will only work if she is still alive...seriously?
((The logic behind that is so far south from logic that the Joker(Batman Universe) is a perfect gentleman and a logical genius.))
Hollywood needed the drama for the movie, but that wasn't as much as curse but more like a spell which only works cause it is supplied by a magical object (heart). While a curse also has also (often) an object which must be destroyed or a way to remove the magic from a person (if you have some mighty wisdom).
The witch queen couldn't have uses/decided on her own heart, cause she was sure to be dead and couldn't make an anchor for the curse on herself, because that would destroy the curse itself when she died, which she was about to be in a second or two. But only because of the weak heartened men who didn't want our hero to die the witch queens heart survived (plague ignored), and that was her master plan...sure...
I just find the logic of this curse & how it is explained and executed way to unreasonable (you can argue with reason on every time[line]).
"The end is not the end, but for the beginning an end is always near."