Fake-killing and then real-killing someone is a game these writers like to play, though, so the theory that Lance’s heart fuels the present curse (assuming it really WAS a curse) seems plausible.
At this point, that seems like the most likely scenario, but I really REALLY wish it was something else. Anything else from the dark curse, something more clever and not overly done would be awesome.
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"To leave an enemy without an answer, say these words to him: Aglaria Pidhol garia Ananus Qepta" and blow in his direction; then he will not know which way he is headed and cannot answer you." - Swedish Trollproverb