Beware of big spoilers – (alleged) casting sides for, among others, the role of a Siren, reveal big scenes with James/David and Snow White/Mary Margaret.

FYeahSnowandCharming writes that episode 1×13 is called ‘What Happened to Frederick’ (?) and reports:

A character named Abigail is advising Prince Charming about the River Guardian, about how every man who faces it leaves an offering first in exchange for mercy. In front of them is a pile of items left behind by those who’d come before him and failed to defeat the creature. Charming insists that he will go the rest of the way alone, though Abigail tries to convince Charming to let her go with him since this is for her. Charming says no.
Charming comes upon the River but sees no sign of the evil creature Abigail had warned him about. He goes to fill his empty water skin, causing the water to ripple. The ripple spreads and a moan-like sound gets louder as the ripple spreads wider, ultimately fading as the ripple fades. Charming starts causing more ripples, thus making the moaning sound get louder, as he searches for the source of the noise. The water starts to churn, and out comes…

…a beautiful, sexy woman in white. It’s the Siren.

CUT TO:

David is alone in his house, looking at a photo of himself with Kathryn. The break-up has taken its toll on him, so he takes his cell phone out and calls…

…Mary Margaret, who’s outside the school, where the kids get picked up. She asks David if he did it [broke up with Kathryn, I’m assuming]. David says he did, and it was really bad. Mary Margaret says she’s sorry, but now she and him can pick up the pieces and start over from a “real place.”

Back at the River, the Siren is trying to seduce Charming, but he is able to resist. The Siren says that she can be anyone he wants, but he still rejects her. The Siren gets angry and says, “Really? You’re immune to me.” She then pours some water from the river over her and she transforms into…Snow White.

We aren’t sure that this is legit, but it sounds pretty real. According to this, it looks like David does end up back with Kathryn in 1×06 ‘The Shepherd,’ despite wanting to leave her for MM. Nooo! But it’s all about the anticipation, right?