"When Can You Start?"

'And this is the office.'
Derrick peered through the door window. It was most definitely the smallest office he'd seen. Not that pub offices were particularly renowned for being roomy. He nodded meekly.
'If you want to have a look inside I'll just run back upstairs and grab your paperwork' said Derrick's new manager, before bounding back down the corridor and up the stairs.
Derrick sat down. He hated being shown round a new place of work. He never really knew what to say or what questions to ask, if any. Although the job was in the bag, Derrick still felt as though he was in the interview stage until he properly began work.
Staring at nothing in particular, Derrick slowly swivveled and turned on the office chair waiting for his new manager to return. He turned over appropriate questions and comments in his mind, and decided against all of them. It didn't matter.
Then Derrick noticed the screen on his right. The CCTV screen that showed all possible angles in the pub. He stood up out of his chair and looked at it.
Boredom and curiosity curdled in Derrick's idle brain as he decided to grab the mouse and select a single screen for closer view. He selected the small, jittery image of the main bar and clicked. The image enlarged and filled the screen instantly. Then Derrick noticed the first odd thing he'd notice that evening.
The pub was empty.
How strange, he thought. It was more than plausible that the solitary bartender who greeted him when he arrived had just nipped out the back for a moment (as a long time bar manager Derrick was all too familiar with that most irritating habit), but there were at least thirty customers in the space that this CCTV camera was covering before he left. There was no way that they'd all leave at the same moment.
Then Derrick felt silly. Of course, he thought, it must be old footage. The time and date begged to differ. The footage of the deserted pub was completely live. He wondered where his manager had gotten to.
Then the second odd thing happened.
He didn't immediately notice what it was about the footage that was wrong, but after a moment of scrutiny Derrick saw it. The empty pint glass that stood on the bar had moved. No, was moving. As clear as these words are to you, Derrick would swear, that glass moved. It slid unsettlingly slowly across the bar. Painfully slowly, almost like it knew it shouldn't be allowed to do that. The jumpy, jittery pixelated footage occasionally distorted its journey and at times the glass appeared to jump suddenly upon its route. Then it reached the edge of the bar. And it kept going.
Derrick was rigid with morbid amazement as he watched the animated glass tumble over the edge of the bar and off the screen. The next odd thing made him jump.
With unbelievable coincidence, a loud smash startled Derrick into a chill and broke his gaze. He darted over to the office door and opened it.
There was a broken pint glass at his feet.
All manner of dread and foreboding lined Derrick's stomach as he considered the impossible. He slammed the door shut and went back to the CCTV screen, his heart pounding.
'Christ' he failed not to say aloud.
He wished he could see the whereabouts of the wayward glass on screen, just to put his mind at ease. The screen was no barer of relief.
The fourth odd thing happened. A door swung open, and nobody emerged. The fifth. Another glass tumbled off the bar. The sixth, the seventh. Eighth. Ninth. Beer pumps turned on by themselves, the beer flowing onto the ground and causing rapidly spreading puddles. That blasted door did not relent in its animation. Things flew by, too blurred by the mediocre camera quality for Derrick to work out what they were. Shadows. Large, ominous things that allowed for no quality or clarity. Something stood in the centre of all the chaos, the smashing glasses and swinging doors, it stood and it stared at Derrick. It stared malevolently. It wasn't actually there, but Derrick could feel it, staring and grinning. Grinning like it wanted to do evil things, grinning like it wanted Derrick to be there when it did them. Its invisible stare was more horrible and more intense than could be achieved by any worldly eyes.
Derrick gasped for breath and stumbled back, almost tripping over the chair as he did. He did not feel safe in the lonely office. He headed for the door.
It was open. Derrick thought he'd closed it, but he wasn't exactly at the height of concentration at this moment in time. He wanted to run away back down the corridor that he and his boss (where had he gotten to?) had came from, but the corridor was no longer there. How could that be? There was a wall in its place, a grey brick wall that looked like it had been there for decades, yet Derrick stepped freely through the space that wall now occupied just minutes before. On the opposing wall there was a door. The only door now, save for the one into the office, that Derrick could escape through. He took it without hesitation.
Breathing heavily and shaking like a dog in the snow, Derrick found himself in the pub. It should have been upstairs. The office was in the basement and Derrick had climbed no stairs. He had taken the door out of the office and somehow he was upstairs. The windows revealing the street outside attested to that. He was horrified and for a moment he shut his eyes tight, unwilling to see in front of him what the CCTV screen had shown.
He opened his eyes.
No activity was to be beheld. The bar remained empty, like it shouldn't have been, but there was no swinging door, no chaotic glasswear and no puddles of beer flowing out from behind the bar.
It wasn't a relief.
As Derrick slowly gazed around the cold, empty pub, taking in the dusty, abandoned wooden tables and old weathered chairs that should have been the carriers of cheer and liveliness but instead acted as a terrible display of isolation and darkness, Derrick still didn't feel alone. He felt as though that thing that he sensed in the middle of the room from the CCTV was still there. He sensed it pacing gleefully around its domain, he felt it staring accusingly at Derrick's intrusion. He didn't know what it wanted but he knew it was close. Facing him. Approaching him. Next to him. Those eyes! They weren't there, but, those eyes!
Derrick breathed deeply and started to move. The pub was so dark, so empty. He realised how big it seemed when uninhabited and the front door felt like it was a world away. He trod with caution slowly toward it. He would not look behind him, for Derrick had convinced himself that the invisible thing had taken form and trod in his shadow, claws outstretched, waiting for him to turn around and see the most horrific face he would ever see again.
Derrick reached the front door. He placed his hands on the cold wood and pushed. The door swung open and he rushed outside into the cold. He was out. It was as dark and lonely outside as it was in the pub but it felt safe and good. Derrick let the double doors swing behind him as he breathed a sigh of relief.
Then a voice from behind him said