After Mark and Rachel climbed over the window they paused for a moment, Rachel asked Mark If he was okay, he nodded. He looked back at the alley, the horde was still coming- this way. Suddenly a figure that was dimly lit waived, "Over here!".
He was a fine young guy, he looked handsome, and troubled. Mark hated what this world took from the young ones, and what it spar back into them. Mark gestured Rachel to help with barricading the stairs. The lot were too busy throwing and stacking every chair and table they got to block off the stairs. They didn't even have time to introduce themselves. Mark helped the young guy with the heavy table, they pushed it together against the greasy and hard floor and into the main door, blocking it off.
As Mark was laboring, he noticed a second older man, this one seemed gritty and experienced. Which meant he was dangerous. He exchanged somewhat bitter eye contact with him (Graham). But it was too dark anyway. The horde was approaching, Mark called Rachel and asked her, "Can you help me block off these windows? ". Mark started pulling chairs and stacking them under the windows, stacking them so they would block off the entrance. A walker could easily push the chairs and climb over, but so far Walkers never showed ability to climb over ledges, they simply walked and growled when they hit an obstacle, where they would just bang it with their hands.
There was a couple windows in the ground floor, Mark and Rachel managed to block them off, and with the main door braced by the heavy table it was safe for the night. The walkers would keep banging against the the main door, but none would come in. The two strangers were stacking chairs and tables from the second floor. So there was no way up for the walkers should they somehow break in. Mark pointed at a small service elevator that could fit a human being, "It's mechanical, they use it to deliver food to the second floor. You go first," he instructed Rachel. As she got in he looked at her and smiled, "you will be alright."
Mark walked over to the stacked chairs at the stairs and called out, "Kid, try to pull up the service elevator, Rachel will be coming up. I'm going next."