[The longer he talks, the more tempting it gets. It does seem like a golden opportunity -- time away from home, with Emma not yet consumed by darkness.

And yet, she remembers quite clearly what disastrous results previous attempts at messing with the timeline had. Remembers Emma coming back from the past with Maid Marian in tow.

Remembers Zelena on the phone, telling her she'd gone back in time and killed Marian before Regina ever could. Before any of them ever had a chance to meet the true Marian. Wronged twice over by Mills women. And it galls her, that the woman she'd thought she had come to actually save this time, about whose life she had come to care, had been her scheming sister all along.

Sure, her initial plan had been to kill Marian all over again, but seeing her frozen body... well. It had been a wake up call.]

I'm... not sure that's such a good idea.

[Her eyes are earnest, understanding even. Regina doesn't like Hook and never will, but she can give him this much.]

I know how you feel, but messing with these things -- there's no telling what would happen. How that would shape the future. Who esle would be collateral damage.