The Science of Pony Deduction

The click clack of two pairs of shoes walking down a silent side-street, the only sounds are of dripping water from the gutters from last nights rainfall and the two men named John Watson and Sherlock Holmes talking to each other.

"See?  Don't you feel better now that we've taken a nice walk?" said John, smiling.

        "Mmph." replied Sherlock with a grim face, he hated Johns' ideas of a good time to keep him distracted from shooting the wall.  He kicked a stray sidewalk chunk into the road.

"I can't believe I let you bring me along on such absurd things, taking a "walk in the park" is a horrible idea." complained Sherlock, his eyes darting around the empty street, looking for something to think about.

"We didn't even go to the park!  You insisted that we go here, I don't know how you thought that it was a good idea to go...searching for thugs or whatever!" John exclaimed, he was tired of Sherlock complaining he was bored, and whenever he tried to get him to do something, he complained about that!  John was just trying to be a good friend.

"Ha!  Thugs!  That would be interesting." Sherlock said, putting his hands in the pocket of his trench coat.

"Sometimes, Sherlock Holmes, I cannot stand you!  You're always just-" his sentence was interrupted by Sherlocks' hand covering his mouth.

"MMPH!!"  John tried to say under his hand.

"Shhhhh." said Sherlock, his pointer finger resting on his lips. John gave him a puzzled look, and Sherlock looked at him.

"Can't you hear it?" whispered Sherlock, his ice blue eyes scanning the surroundings, obviously captivated by whatever he was hearing.  John decided to go along with it, and strained his hearing in order to find the sound.  He realized there was a gurgling sound...but not just gurgling, swirling and swooshing, sizzling and crackling.

John took Sherlocks hand off his mouth,

"What is it?" he whispered, trying not to disturb Sherlocks' listening.

"I don't know...lets go find out!" exclaimed Sherlock, and starts to speed walk in the general direction of the sound.

Sherlock and John walk about a block from where they where, and skid to a halt in front of an alleyway.  However, it is concealed by a thin sheet.  Sherlock looks at John, his eyes flicker with excitement, they don't dare say a word, they where speechless with curiosity.  Sherlock slides the curtain out of the way, and enters, John close behind him.  They both enter the concealed alley.

         They stare into the darkness, almost hypnotized by the glowing ellipse on the wall ending the alley.

It was a portal.