I know this probably isn't a popular idea, but I don't think Myrcella is dead. When the sand snake grabs Bronns hand I think she gives him a vile of the antidote. And is a lewd comment and a bite on the ear really enough to get Bronn frazzled. Or was the look of confusion because she slipped him the antidote? If not, I know its nitpicking, but it shows a lack of understanding of his character no matter how small of a moment. Won't really know till next season, but I'm probably reaching here.