Redundant storylines seem to be a popular theory on the boards these days, aren’t they? So I don’t know if I’d rule out Charming getting poisoned again on that basis. There’s better reasons to rule that happening out.
I don’t think Zelena is trying to poison Charming. It looked more like she was adding a magic substance or a root powder. Maybe her goal is to alter Charming’s state of mind to be less suspicious of her.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy