Zombie apocalypse

You were watching the ground above the 7th floor abondened building, you were using your telescope just in case you see a zombie, when you suddenly saw 4 boys walking , once was carrying 4 bags(will), one was holding a map(Peter), one was holding a dual gun (Miles), and lastly one was holding a rifle. As you continue watching them one of them saw you(Miles) you were scared, shocked, surprised. You asked how did he see you in such height? Your on the 7th floor building and hes staring at you in the eye deadly, coldly, and scary, but you were relieved he didnt alert the others instead he stopped.