You cannot escape him. No matter how far you run, he will kept chasing. The only escape is being caught. Being trapped forever within the yellow walls, there will be an escape at some point, weather it be a few seconds later, or years, decades, centuries. You can only go deeper, you can never go back. One moment, you may be within yellow walls, listening to the hum of flourecent lights, then you could be being chased, down old and new halls, and right after, you could be falling down a endless hole, waiting for the moment you hit the floor, for the moment you finally escape.