Although conceivable, The Plan would involve a lot of work; but the four plotters were ready for anything that would drive Aragorn insane. Eowyn, however, wasn't quite up to it, so they decided to give her a different part, which, they discovered, would be invaluable and save themselves a lot of work.
"Ok, Eowyn, you get to start The Plan in motion." Eomer told her, when she complained that they were going to far too much trouble just to make a king mad.
"And what am I going to have to do?" Eowyn asked suspiciously.
"You can lure the guards off with your beauty!" said Eomer.
"How am I going to do that?" asked Eowyn.
"Oh, it'll be easy!" said Legolas. All you have to do is walk down there flaunting your beauty, say 'Betcha can't catch me!' and run away! They're sure to follow you.
"All of them? Are you sure?"
"Of course! Now you know your part, we can go on and work on The Plan. Eomer, where are the rats?"
"The rats? Oh, they're hidden in a closet. I'll go get them. Ok here they are. You all know the plan. Go get the oil, the fishing line, the boards, and let's get going!"
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The 5 plotters snuck along the passageways, tripping over each other and making rather more noise than was preferable. Eowyn still didn't feel too good about it, but she walked confidently in the direction where she knew the guards would be lurking.
Sure enough, as she reached the spot, 2 guards leaped out from hiding, blocking her way. "What is your business here?" One snapped. Eowyn smiled charmingly and disarmingly.
"I said, what are you doing here?" Repeated the guard.
"Mmm…nothing much." Eowyn replied.
"Well, go away. You're not supposed to be here."
The other guard, one of Eowyn's many secret admirers, glared at his companion. Eowyn noticed this with pleasure; it would make her job even easier. She walked on.
"Stop! Stop!" shouted the guard. "Stop, or you're under arrest!"
Eowyn stopped, walked on a couple more steps, then turned around and ran the other way, calling back over her shoulder, "Betcha can't catch me!"
It worked. The guards fell for it, and became so absorbed in the chase that they did not notice the twins, pressed flat against the wall as they streaked by.
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Elladan and Elrohir worked quickly to construct the tripline and pour oil all over the floor. Then they strung up some boards and various other implements to fall from the ceiling and create a barricade when activated by another fishing line. Now their part was done. The Plan could finally come to its fruition.
All that remained was…The Rats! Eomer and Legolas had waited the previously determined time, and hoped that the Twins had finished. They released the rats through the window into the guardroom. Instantly there was chaos. Guards were running, shouting, and trying to catch the rats. Annabelle led the rats out the door and down the hall, and the guards followed the rats. Eomer chased after them to activate the barricade, while Legolas handed all the Ice Cream out the window to the Twins, who had returned with a cart. As the guards screamed and shouted curses down upon them, the five plotters, together again, were wheeling the cart away.