They follow the little red car and Marie's matching red scarf until the lake is clearly visible between buildings touting everything from eye surgery to sushi to karaoke. All the hotels are either ridiculously expensive or too far from the lake, so Sam is rather curious to find out what she's doing as she drives directly to a lake community and hunts the houses for one that is empty – and, it turns out, one with which she is quite familiar. With a swift, confident step, she unlocks the door with one of the many keys on her ring and disarms the system deftly. Sam and Dean try bravely to keep their eyes from wandering around the expansive house, Sam more so than Dean, who is also busy trying to maintain his sneer of indifference. Marie grins at them, locks the front door again, and opens the drapes to the deck.
"Welcome, gentlemen, to Rose's lake house." They look out over the boat dock to the lake and Marie smiles. Dean just scoffs and throws his stuff on the leather sofa.
"It's not that great," he says, maintaining his gruff cover. Marie smiles ruefully and drops her eyes.
"Okay," she whispers to herself before lifting her eyes again. "I'm going to change clothes and find the keys to the boat. The kelpie will try to get me first, since women seem to be the target. This may mean we're in luck and there isn't a Fainean out there, but don't count on it. I'll be bait, anyway." Sam looks dubious.
"I'm not sure you should," he says. "I don't want to put you in danger." Marie is already halfway up the stairs, her ever-swinging black dress swirling like clouds around her legs.
"Don't worry, Sam. I can handle it. I used to ride Meteor all the time, on land and in water. Besides – I have a human bridle." She gives a devious grin and bounds up the stairs. Sam's face tightens and he sits next to Dean. "You're still kind of a dick, you know that?" he says after a while. "You haven't changed towards her one bit." Dean shakes his head and lifts his boots to the coffee table.
"Nope. I don't plan to, either. I don't have to like her as much as you do. I don't have to like her at all, actually." Sam sighs.
"Okay, fine. If that's what you want, that's fine. Just… for me, Dean, be civil." Dean looks at Sam unhappily and turns on the television without answering.
By the time they're out on the water, Dean has been briefed on how to kill kelpies, Sam is momentarily enjoying the wind in his hair, and Marie is dancing to pop music as she steers the boat in the sun.
"Look for bizarre clumps of reeds and algae growing in fingers in towards the center of the lake," she shouts to the boys. "We're in the range of the killings now." Sam nods and leans out over the side of the boat, eyes scrutinizing the horizon. Marie smiles as she looks back at him, wishing ruefully it were just another day on the lovely lake.
A hissing sort of scream penetrates her ears as the Fainean rises unnervingly from the water and pulls Sam in. Marie cuts the engine through her stream of profanity and turns the wheel towards where Sam went under, trying to avoid clipping him with the motor.
"Don't go in, Dean!" she says just as he's stripping off his shirt. "You're male; she'll take you too! Wait for the kelpie! DO NOT LOWER ANCHOR!" With a quick pound of feet and an inhuman leap she is headfirst in the water.
"Damn it!" he says vainly, and punches the seat. He watches the surface of the water for any break, but there is none. He starts to count to sixty.
Meanwhile, Marie's water-breathing spell has kicked in, and her nose, mouth, and eyes all seem as milky white as the Fainean's. She follows the woman fey closely, though the faerie is dragging Sam under quicker and quicker. She summons a burst of reserve energy to momentarily blind the Fainean with octopus ink, the most water-related piece of magic she can think of, and seizes Sam, kissing him forcefully to give him breath.
It's a race against Dean's counting to get away from the Fainean. She pushes Sam up first, panting in the water as Dean says "sixty" before pulling him up over the side of the boat.
"She's angry," Marie gasps. "Get ready, because she'll send the kelpie – " and she is back under water before Dean can say anything, pulled helplessly by the water horse. Sam is already coughing up what water was in his lungs and scrambling for the bridle.
"Give me that," Dean says, "and sit down. Be ready to get out of here in a hurry." Sam nods, still coughing, and Dean peeks over the side, careful to avoid the Fainean. If he didn't believe in faeries before, he does now, and suddenly there Marie is, water and leaves, leaping over nothing and holding onto the horse's mane. He throws out the bridle. She catches it. In the moment before it touches the dark horse's neck, their eyes meet and she throws him an iron bracelet. Then she and the kelpie are underneath again and Dean knows he's bait for the Fainean just like she was bait for the kelpie and all they have to do now is wait.
He cocks his gun and puts on the bracelet.